CN116761084B - Full-load view dividing method for remote sensing satellite double-linear array and three-linear array cameras - Google Patents
Full-load view dividing method for remote sensing satellite double-linear array and three-linear array cameras Download PDFInfo
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Abstract
The invention relates to the technical field of remote sensing, and provides a full-load scene distribution method of a remote sensing satellite double-linear array camera and a three-linear array camera, which aims at the problem that only paired load data is distributed in the existing product data of the remote sensing satellite double-linear array camera and the three-linear array camera, but the paired load data which cannot be paired due to different imaging ranges is not distributed, the paired scene distribution among loads is carried out by taking a geographic overlapping range as a reference, and the individual scene distribution is carried out on the load data of the remaining double-linear array camera and the three-linear array camera which cannot be paired, so that the traditional method for only distributing paired load is replaced, the problem of omission in the process of distributing the load data is solved, and the distribution quantity of the data is improved.
Description
Technical Field
The invention relates to the technical field of remote sensing, in particular to a full-load scene splitting method of a remote sensing satellite double-linear array and three-linear array camera.
Background
At present, a remote sensing satellite generally adopts a double-linear array or three-linear array imaging mode, a stereoscopic image is formed by observing different view angles of the same ground through a front view camera, a front view camera and a rear view camera with a certain intersection angle, and meanwhile, the three-dimensional ground coordinates of the image are accurately obtained by matching with accurate internal and external azimuth element parameters. For the positions which cannot be covered by the double-linear-array and three-linear-array cameras on the same ground, a single load image product is not generally provided, so that the problem that the load of the cameras cannot be fully utilized is caused.
Disclosure of Invention
The invention provides a full-load scenery-dividing method for a double-linear-array and a three-linear-array camera of a remote sensing satellite, which is used for solving the defect that load data of the double-linear-array and the three-linear-array cameras in the prior art cannot be fully utilized, solving the problem of missing the load data and improving the distribution quantity of the data.
The invention provides a remote sensing satellite double-linear array and three-linear array camera full-load scenery-dividing method, which comprises the following steps:
according to the front-back sequence of the two-linear array camera and the three-linear array camera of the remote sensing satellite to the ground, determining that the load imaged first is a reference load and the load imaged later is a non-reference load;
determining the load column width of satellite load data landscaping, performing landscaping on the reference load according to a first row height equal to the load column width, determining the geographic coverage area identical to the row direction of the reference load, taking the reference load as a reference, determining a second row height according to the geographic coverage area identical to the row direction, and performing landscaping on the non-reference load according to the second row height;
determining a geographic overlapping range of the reference load and the non-reference load after scenery division, and pairing the reference load and the non-reference load after scenery division based on the geographic overlapping range to obtain a double-linear-array pairing load and a three-linear-array pairing load;
taking the residual data of the reference load and the non-reference load without the geographic overlapping range as a single load;
and distributing the single load, the double-linear array pairing load and the three-linear array pairing load.
According to the full-load scenery-dividing method for the remote sensing satellite double-linear array camera and the three-linear array camera, which are provided by the invention, the double-linear array camera and the three-linear array camera also comprise multispectral cameras;
the method further comprises the steps of: and determining a third row according to the same geographical coverage range in the row direction by taking the reference load as a reference, and carrying out scene division on the multispectral camera load according to the third row.
According to the full-load scenery-dividing method for the remote sensing satellite double-linear array camera and the three-linear array camera, the double-linear array camera and the three-linear array camera both comprise a plurality of loads;
after the base load and the non-base load after the scenery are paired based on the geographic overlapping range to obtain the double-linear-array pairing load and the three-linear-array pairing load, the method further comprises the steps of:
determining that the single payload is unpaired remaining data of the same camera;
and determining a fourth row according to the same geographic coverage range in the row direction by taking the reference load as a reference, and carrying out scenery division on the unpaired residual data based on the fourth row.
According to the full-load scenery-dividing method for the remote sensing satellite double-linear-array and three-linear-array cameras, which is provided by the invention, after the multispectral camera load is subjected to scenery division according to the third row, the method further comprises the following steps:
and respectively adding the multi-spectral camera load after scene division into the double-linear array pairing load and the three-linear array pairing load to obtain the double-linear array multi-spectral pairing load and the three-linear array multi-spectral pairing load.
According to the full-load scenery-dividing method for the remote sensing satellite double-linear-array and three-linear-array cameras provided by the invention, after scenery division is performed on the unpaired residual data based on the fourth row, the method further comprises the following steps:
pairing the rest data after the scenery is paired, and obtaining the independent pairing load.
According to the remote sensing satellite double-linear-array and three-linear-array camera full-load scenery-dividing method, the double-linear-array paired load, the three-linear-array paired load and the single load without the geographic overlapping range are respectively distributed according to the geographic overlapping range by pairing the base load and the non-base load after scenery division, so that all imaging load data can be completely distributed without omission and repetition, the problem of load data omission is solved, and the distribution quantity of the data is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a remote sensing satellite double-linear array and three-linear array camera full-load scenery-dividing method;
FIG. 2 is a view-dividing method of the reference load of the present invention;
FIG. 3 is a view-finding method of the non-reference load of the present invention;
FIG. 4 is a single load scenery approach of the invention;
FIG. 5 is a full load distribution scenario pair data distribution method of the present invention;
FIG. 6 is a schematic diagram of a dual linear array pairing load of the present invention;
FIG. 7 is a schematic representation of a three-linear array paired load of the present invention;
FIG. 8 is a full load view and distribution method of the present invention;
fig. 9 is a schematic flow chart of a high-resolution seventh full-load view-dividing example of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a remote sensing satellite double-linear array and three-linear array camera full-load scenery-dividing method, which comprises the following steps:
step 110, determining that the load imaged first is a reference load and the load imaged later is a non-reference load according to the front-back sequence of the two-linear array camera and the three-linear array camera of the remote sensing satellite for imaging the ground.
Specifically, in the present embodiment, it is first described that the dual-line camera of the remote sensing satellite includes a front view camera and a rear view camera, and the dual-line camera includes a front view camera, a rear view camera and a front view camera.
And determining a reference load and a non-reference load according to the sequence of the ground imaging of the double-linear-array camera and the three-linear-array camera, wherein if the imaging is a rearview camera, the front-view camera is the non-reference load in the double-linear-array camera, and the front-view camera are the non-reference loads in the three-linear-array camera.
In this embodiment, the rearview camera, that is, the rearview load is a rearview full-color load, and accordingly, the forward-looking camera is a forward-looking full-color load, and the forward-looking camera is a forward-looking full-color load.
Step 120, determining a load column width of satellite load data scenery, dividing the reference load according to a first row height equal to the load column width, determining a geographic coverage area identical to the row direction of the reference load, determining a second row height according to the geographic coverage area identical to the row direction by taking the reference load as a reference, and dividing the non-reference load according to the second row height.
In this embodiment, the scenery-dividing modes of the reference load and the non-reference load are respectively embodied.
For the reference load, the shots are separated by a row height equal to the load column width, i.e. by the first row height. It should be noted that the satellite payload data is input as a split-view of the strip data, the payload column width thereof is that of the reference payload, the payload column width thereof is the number of payload CCD pixels, and the length thereof is the number of rows scanned in the satellite advancing direction.
Referring to fig. 2, fig. 2 is a view dividing method of the reference load of the present invention, comprising the steps of:
step 210, determining a single scene length;
220, sequentially dividing scenes along the satellite flight direction to determine scene numbers;
step 230, calculating the geographical range of the scene;
and 240, producing metadata files to finish scenery division.
Specifically, the scenery dividing process of the reference load is as follows: firstly, determining the size of a scene by taking the width of a rearview full-color load column as the width and the length of the line number equal to the width of the load column as the length, namely dividing the shape of each complete scene into squares. Then, starting from the first row of the length, sequentially dividing scenes along the satellite advancing direction according to the dividing scene size, and considering proper coincidence between adjacent scenes, wherein scene numbers are sequence numbers of sequential dividing scenes; finally, according to the initial line and row of each scene image, the geographical range, imaging time and the like of the scene image are calculated from the files such as a line file, an ephemeris gesture and the like to form a metadata file, and the scene division of the reference load is completed.
Accordingly, for the non-reference load, it is necessary to determine the row height (i.e., the second row height) according to the same geographical coverage in the row direction with reference to the reference load, and to perform the scene division according to the second row height.
Referring to fig. 3, fig. 3 is a view-dividing method of a non-reference load of the present invention, comprising the steps of:
step 310, obtaining a reference load scenery-dividing geographical range;
step 320, back calculating initial rows corresponding to other loads according to the geographic range;
step 330, judging whether the back-calculated scene range is valid;
step 340, confirming that the scene is matched, and confirming a scene number;
and 350, producing metadata files to finish pairing load scenery distribution.
Specifically, the method for carrying out association scenery division by taking the reference load as the reference by the non-reference load comprises the following steps: firstly, sequentially reading metadata of each scene of a reference load, and acquiring a geographic range of the metadata; secondly, according to a geographic range of a certain scene of the reference load, combining related contents in other non-reference load auxiliary data, and back calculating the starting and ending line numbers of other non-reference load strip data corresponding to the geographic range; again, it is determined whether the number of other non-reference load rows and columns that are being back calculated are valid values. If the calculated starting time of the other non-reference load scenery division is larger than 0 and the scenery length is in the appointed range, the other non-reference load data are effective in the scenery range, the effective association scenery is judged, and the scenery number of the corresponding scenery of the reference load is assigned to the association scenery. And finally, forming metadata of other non-reference load associated scenes. And circulating in this way, all other non-reference loads associated with the reference load geographic positions are subject to scenery.
It is particularly noted that the non-reference load scene shape need not be square, as the line height of the non-reference load is determined according to the geographical extent of a scene.
Further, the double-linear-array camera and the three-linear-array camera also comprise multispectral cameras;
the method further comprises the steps of: and determining a third row according to the same geographical coverage range in the row direction by taking the reference load as a reference, and carrying out scene division on the multispectral camera load according to the third row.
And respectively adding the multi-spectral camera load after scene division into the double-linear array pairing load and the three-linear array pairing load to obtain the double-linear array multi-spectral pairing load and the three-linear array multi-spectral pairing load.
That is, for a remote sensing satellite, the satellite generally includes a multispectral camera in addition to a front view, and a rear view, which can be three-dimensionally imaged. The multispectral camera also uses the same rule and the reference load as the reference, determines the row height according to the same geographic coverage range in the row direction (namely the third row) and performs the scene division according to the third row.
After the multispectral cameras are subjected to scene division, multispectral camera loads with overlapped geographic ranges can be added into the double-linear array pairing load and the three-linear array pairing load to form the double-linear array multispectral load and the three-linear array multispectral load.
Further, the dual-linear-array camera and the three-linear-array camera both comprise a plurality of loads;
after the base load and the non-base load after the scenery are paired based on the geographic overlapping range to obtain the double-linear-array pairing load and the three-linear-array pairing load, the method further comprises the steps of:
determining that the single payload is unpaired remaining data of the same camera;
and determining a fourth row according to the same geographic coverage range in the row direction by taking the reference load as a reference, and carrying out scenery division on the unpaired residual data based on the fourth row.
Specifically, the front view camera, and the rear view camera in this embodiment may include multiple loads, and after the paired loads such as the double-line array and the three-line array are split, for the remaining data, different non-reference loads of the same camera are also determined according to the same ground coverage in the row direction by taking the reference load as a reference according to the same rule, and the split is performed according to the fourth row.
And 130, determining a geographic overlapping range of the base load and the non-base load after the scenery division, and pairing the base load and the non-base load after the scenery division based on the geographic overlapping range to obtain a double-linear-array pairing load and a three-linear-array pairing load.
Specifically, the above steps are used for pairing a plurality of loads overlapped in geographic range to form paired loads such as a double linear array and a three linear array.
The scenery with the same scenery number in the double linear array and the three linear array is subjected to scenery dividing operation, and the geographic range of the scenery is kept consistent. And forming a group of data with the same geographic range, namely different geographic overlapping ranges and different load names, and reserving information of other paired loads in metadata files of all loads to form paired loads such as a double linear array, a three linear array and the like.
And 140, taking the residual data of the reference load and the non-reference load without the geographic overlapping range as a single load.
For a single load, if strip data of unpaired scenes is still available, the method proceeds according to the mode of base load scene division, and the scene length is consistent with the length of the matched scenes of the load. The scene number is incremented by taking the row direction as a reference and the matched scene number Jing Jing as a reference.
Referring to fig. 4, fig. 4 is a single-load scenery-dividing method of the invention, comprising the steps of:
step 410, judging whether unpaired data exists;
step 420, performing scene division on unpaired data according to the rank number;
step 430, obtaining pairing scene number Jing Jing;
step 440, sequentially increasing the scene numbers to produce new scene numbers;
and 450, producing metadata files to form individual load scenery.
Further, after the scenery of the unpaired remaining load based on the fourth row, the method further comprises:
pairing the residual loads after the scenery division to obtain independent paired loads.
That is, when the load in the unpaired front and rear view cameras cannot be paired with the other load in the front and rear view cameras, the load can be paired with the load of the multispectral camera to obtain the multispectral camera paired load.
And 150, distributing the single load, the double-linear array pairing load and the three-linear array pairing load.
And finally, distributing the single load, the multispectral camera pairing load, the double-linear array pairing load and the three-linear array pairing load.
At the time of distribution, it is necessary to first read the metadata file to determine whether it is a pairing load. If the load is the pairing load, carrying out joint distribution on all load data in the load group; if the load is single, the scene data is distributed separately. Through such operation, all of the imaging payload data can be distributed without omission and without repetition.
According to the remote sensing satellite double-linear-array and three-linear-array camera full-load scenery-dividing method, the double-linear-array paired load, the three-linear-array paired load and the single load without the geographic overlapping range are respectively distributed according to the geographic overlapping range by pairing the base load and the non-base load after scenery division, so that all imaging load data can be completely distributed without omission and repetition, the problem of load data omission is solved, and the distribution quantity of the data is improved.
Referring to fig. 5, fig. 5 is a full-load distribution scene pairing data distribution method of the present invention, including the steps of:
step 510, circularly reading the metadata of the scene data after the scene division;
step 520, judging the load type; if the paired load is performed step 530, if the individual load is performed step 540;
step 530, distributing image data, metadata and the like of all paired loads of the scene one by one;
step 540, distributing the scene image data, metadata, etc.;
step 550, the distribution is completed.
Referring to fig. 6 and 7, fig. 6 is a two-linear array pairing load schematic, and fig. 7 is a three-linear array pairing load schematic;
as shown in fig. 6, for a dual-linear camera, the conventional method distributes only the dual-linear paired load portions shown by the solid lines of the common geographic area (for visual representation, the geographic areas shown in the figure only describe satellite flight direction coverage), while distributing no broken line portions without common geographic coverage; the invention not only distributes the double-linear array pairing load part, but also distributes the rear-view multispectral full-color pairing load and the front-view independent load respectively for the part within the range of the dotted line.
As shown in fig. 7, for a three-line camera, the conventional method distributes only the three-line paired load portions shown by the solid lines of the common geographic range (for visual representation, the geographic range shown in the figure only describes satellite flight direction coverage), while distributing the broken line portions without the common geographic coverage; the invention not only distributes the double-linear array pairing load part, but also distributes the rear-view single load, the front-view multispectral pairing load and the front-view single load respectively for the part within the range of the dotted line.
Referring to fig. 8, fig. 8 is a full-load view and distribution method of the present invention, comprising the steps of:
step 810, determining a reference load, and determining row heights and landscaping according to the same geographic coverage area in the row direction;
step 820, carrying out multi-load pairing on the scenery data;
step 830, unpaired loads form a single load;
step 840, no missing, no duplicate distribution of paired loads, single load.
The overall procedure of the present invention is described in detail below using 20996 orbit data imaged by high-resolution satellite No. 20230716 as an example.
Referring to fig. 9, fig. 9 is a schematic flow chart of a full-load scene example with a high score of seventh, comprising the steps of:
step 910, determining the rearview full color as a reference load;
step 920, dividing the rearview panchromatic into scenes according to the rank number;
step 930, performing scene distribution pairing by taking back vision multispectral and front vision panchromatic as references to form double-linear array load pairing;
step 940, performing scene-dividing pairing on the residual rearview multispectral and rearview panchromatic to form rearview panchromatic multispectral load pairing;
step 950, performing independent scene distribution pairing on the final residual front vision panchromatic;
step 960, no omission, no repetition distribution.
The specific process is as follows:
A. determining a reference load and associating scenery divisions
The rearview camera of the high-resolution seventh satellite is used for imaging first, and the rearview full-color load is taken as a reference load.
Benchmark load-rearview panchromatic load split: firstly, determining the size of a scene by taking the width of a rearview full-color load column as the width and the length of the line number equal to the width of the load column as the length, namely, the shape of each complete scene is square; secondly, starting from the first row of the length, sequentially dividing scenes along the satellite advancing direction according to the dividing scene size, wherein 15% of ground features between adjacent scenes are overlapped, and the scene number is the serial number of the sequential dividing scenes; finally, according to the initial rank of each scene image, the geographical range, imaging time and the like of the scene image are calculated from the files such as a line file, an ephemeris gesture and the like to form a metadata file. The full color load of the rear view of the rail data is 1-108.
Non-baseline load-rearview multispectral load, forward-looking panchromatic load split: firstly, sequentially reading metadata of each scene in a reference load-rearview full-color load, and acquiring a geographic range of the metadata; and secondly, reversely calculating the start and end line numbers of the strip data of the rearview multispectral load and the forward-looking panchromatic load corresponding to the geographic range according to the geographic range of a certain scene of the rearview panchromatic load and combining the related contents in the auxiliary data of the rearview multispectral load and the forward-looking panchromatic load. And judging whether the back vision multispectral load and the front vision panchromatic load are valid values or not, if the back vision multispectral load and the front vision panchromatic load are calculated, the scene number of the scene corresponding to the reference load is assigned to the associated scene if the back vision multispectral load and the front vision panchromatic load are calculated, the scene length is 1/4 of the scene length and is greater than Jing Kuandu, and the scene range of other non-reference load data is valid. Finally, metadata of the scene is formed by the back vision multispectral load and the front vision panchromatic load. And by circulating in this way, all rearview multispectral loads and forward-looking full-color loads associated with the geographic positions of the reference loads are subjected to scenery division.
The imaging geographical ranges of the rearview camera and the forward camera are not identical, so that residual data exist after the images are separated according to the double-linear-array load. It is specifically noted that the non-reference load rearview multispectral load and the reference load rearview panchromatic load in the rearview camera can be paired secondarily. However, because the two loads are imaged simultaneously and end simultaneously, the remaining rearview multispectral load does not need to be re-viewed again with the rearview panchromatic load as the reference load.
B. Multi-load pairing
And forming a group of data of three loads, such as back vision panchromatic, back vision multispectral, front vision panchromatic and the like, with the same geographic range and the same scene number, and reserving information of other paired loads in metadata files of all the loads to form double-linear-array paired loads. Its scene number is 16-108.
And for the residual data of the rearview panchromatic and the rearview multispectral which are not matched into the double-linear array load, the rearview panchromatic is used as a reference load for pairing, so that the rearview multispectral panchromatic paired load is formed. The scene number is 1-15.
C. Unpaired to form a single load
After the bilinear paired load is formed, the forward looking panchromatic load still has unpaired data. The data is located after the paired scene, the scene number is incremented. And forming independent forward-looking full-color load scene division data, wherein the scene division length is consistent with the forward-looking full-color load scene length in the double-linear array load, and the scene numbers are 109-124.
D. Non-missing, non-duplicate distribution
And distributing the single load, the double load and the three load pairs. The double-linear array pairing load data with the scene number of 16-108 are combined and distributed with three load data of back vision panchromatic, back vision multispectral and front vision panchromatic with the same scene number; for rearview full-color paired load data with the scene numbers of 1-15, combining and distributing rearview full-color and rearview multi-spectral data with the same scene number; for the forward looking full color load with scene numbers 109-124, a separate distribution is performed.
Through the operation, the full-color load data of the 108-scene rearview mirror, the multi-spectrum of the 108-scene rearview mirror and the full-color load data of the 109-scene rearview mirror can be completely distributed without omission and repetition.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The full-load scenery dividing method for the remote sensing satellite double-linear array and three-linear array cameras is characterized by comprising the following steps of:
according to the front-back sequence of the two-linear array camera and the three-linear array camera of the remote sensing satellite to the ground, determining that the load imaged first is a reference load and the load imaged later is a non-reference load;
determining the load column width of satellite load data landscaping, performing landscaping on the reference load according to a first row height equal to the load column width, determining the geographic coverage area identical to the row direction of the reference load, taking the reference load as a reference, determining a second row height according to the geographic coverage area identical to the row direction, and performing landscaping on the non-reference load according to the second row height;
determining a geographic overlapping range of the reference load and the non-reference load after scenery division, and pairing the reference load and the non-reference load after scenery division based on the geographic overlapping range to obtain a double-linear-array pairing load and a three-linear-array pairing load;
taking the residual data of the reference load and the non-reference load without the geographic overlapping range as a single load;
and distributing the single load, the double-linear array pairing load and the three-linear array pairing load.
2. The remote sensing satellite double-linear-array and three-linear-array camera full-load scenery-dividing method according to claim 1, wherein the double-linear-array camera and the three-linear-array camera further comprise a multispectral camera;
the method further comprises the steps of: and determining a third row according to the same geographical coverage range in the row direction by taking the reference load as a reference, and carrying out scene division on the multispectral camera load according to the third row.
3. The remote sensing satellite double-linear array and three-linear array camera full-load scenery-dividing method according to claim 1, wherein the double-linear array camera and the three-linear array camera comprise a plurality of loads;
after the base load and the non-base load after the scenery are paired based on the geographic overlapping range to obtain the double-linear-array pairing load and the three-linear-array pairing load, the method further comprises the steps of:
determining that the single payload is unpaired remaining data of the same camera;
and determining a fourth row according to the same geographic coverage range in the row direction by taking the reference load as a reference, and carrying out scenery division on the unpaired residual data based on the fourth row.
4. The method of claim 2, wherein after the multi-spectral camera loading is split according to the third row, the method further comprises:
and respectively adding the multi-spectral camera load after scene division into the double-linear array pairing load and the three-linear array pairing load to obtain the double-linear array multi-spectral pairing load and the three-linear array multi-spectral pairing load.
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