CN101963663A - Method for correcting abnormal data of 1B level remote sensing image of moderate resolution imaging spectrometer (MODIS) - Google Patents
Method for correcting abnormal data of 1B level remote sensing image of moderate resolution imaging spectrometer (MODIS) Download PDFInfo
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Abstract
The invention discloses a method for correcting abnormal data of a 1B level remote sensing image of a moderate resolution imaging spectrometer (MODIS), which is mainly used for solving the technical problems of the correction of numerical abnormity of an image element point and data abnormity of an image edge in the image. The method comprises the following steps of: finding out a part with image and latitude data abnormities at the edge of each stripe according to the data imaging characteristic of the MODIS; correcting abnormal latitude data and image data in a linear interpolation mode; and rapidly correcting other abnormal data through homonymic image element points of an overlap region between adjacent images. Abnormal data in the image is corrected rapidly according to the imaging characteristic of the MODIS data and the overlap of receiving regions of a digital video broadcasting-satellite (DVB-S) system for the abnormal data in a 1B level strip image of the MODIS. The method is simple and has high implementation efficiency and good correction effect.
Description
Technical field
The invention belongs to remote sensing image data preconditioning technique field, specifically a kind of correction at the abnormal data in Moderate Imaging Spectroradiomete (MODIS) the 1B level band image that receives by digital broadcasting satellite system (DVB-S), utilize the range of receiving and the utilization identical characteristics of overlapping region data wherein of the imaging law and the DVB-S ground receiving station point of MODIS data, realize the method for the quick correction of abnormal data in the MODIS image.
Background technology
Moderate Imaging Spectroradiomete (MODIS) is one of important in the works sensor of earth observing system (EOS), have characteristics such as ageing height, wide coverage, spectral information be abundant, can provide comprehensively for monitoring and forecast in real time, enrich, information timely, and in sudden natural, environmental hazard, be widely used.
In order to improve the shared level of China's remotely-sensed data, share in Department of Science and Technology's science data under the support of engineering, State Satellite Meterological Center utilizes DVB-S to set up the MODIS shared platform, Beijing, Guangzhou and Urumchi land station by the subordinate of State Satellite Meterological Center, and 6 land stations in the subordinate's of National Bureau of Oceanography Sanya, Tibet and ocean office receive the remote sensing satellite data, all data are aggregated into State Satellite Meterological Center, generate 1A/1B level data; By the DVB-S system, adopt the mode of digital video that all uniform data packings are uploaded to communications satellite, and broadcast at last to the demestic user.The demestic user only needs simple video reception apparatus, just can cheap price use these satellite remote sensing dates.
Important component part as the MODIS of Chinese earth observation system shared platform, DVB-S (digital video broadcast system) can provide MODIS quasi real time data for China researchist, promote the scientific research of China's association area, greatly improved the shared level of China's remotely-sensed data.But owing to reasons such as signal interference, in the data that the user receives by the DVB-S system, there is more abnormal data in indivedual images, be mainly image DN value and geo-location data unusually.
For the correction of exceptional value in the remote sensing image, mainly utilize space or time to go up the autocorrelation of adjacent picture elements in the past, and adopted regular hour or space interpolation method that the abnormal data in the image is revised.But for the MODIS remote sensing image, the surface area that single pixel covers is bigger, is subject to polytropic atmosphere elements affect such as cloud, has reduced its space-time autocorrelation.And said method obtain be calculated value behind interpolation arithmetic, with actual value can there is some difference, and be difficult to concentrating a large amount of abnormity point or the band that distribute to carry out the high precision correction.
Summary of the invention
A kind of modification method at the abnormal data in Moderate Imaging Spectroradiomete (MODIS) the 1B level band image that receives by digital broadcasting satellite system (DVB-S) of providing at the deficiencies in the prior art is provided, the quick correction of abnormal data in the MODIS image is realized in the imaging law by utilizing the MODIS data and the overlapping region of DVB-S ground receiving station point range of receiving.
The technical problem to be solved in the present invention is: the searching of data exception zone in the image comprises searching of image picture element value and image edge data exception zone; Filling up of the deletion of unusual latitude data and deletion back data; How to search adjacent MODIS image between a plurality of websites, and therefrom find out the overlapping region between the image of reception, the abnormal data in the pixel point of the same name in the overlapping region is revised etc.
Technical scheme of the present invention is: the overlapping judgement overlapping region that utilizes adjacent scanning band latitude data in the image, by the suppressing exception data and utilize the mode of linear interpolation to fill up the latitude data and the corresponding image data of deletion, the overlapping region band that utilizes revised latitude data and image data to carry out between the adjacent image simultaneously mates, finally abnormal data is wherein carried out the replacement of same place, realize the correction of abnormal data, its concrete steps are:
Step 1: the reading of Moderate Imaging Spectroradiomete image data and longitude and latitude data
Use function in the hierarchy type file layout class libraries to carry out reading of all data that Moderate Imaging Spectroradiomete obtains, carry out according to the following steps:
A), open hierarchy type file layout file and initialization interface;
The science data set name that b), will read claims to be converted to the call number of data set;
C), open corresponding science data collection according to the call number of data set;
D), definition is by the reference position of read data collection and final position;
E), the information of reading of data collection, the data that the read order according to scan line and scan columns correspondence is left in the row and column of two-dimensional array correspondence;
F), the visit of end data collection;
G), judge whether to run through all data sets;
H), finish interface, close hierarchy type file layout file;
Step 2: the searching and revising of the unusual latitude of image edge data area
A), cut apart the latitude data by scanning strip
With the latitude data that leave in the two-dimensional array, since first row, be unit with the shared pixel of single scanning strip on the single-row direction, be unit promptly with 10 pixels, the latitude data of these row are divided;
B), search overlapping latitude data
According to the order of scanning strip, from the latitude data array of having divided, extract the latitude data of two adjacent scanning strips successively, contrast and find out the lap of latitude data between two scanning strips, this lap promptly is the scope of abnormal data;
C), the overlapping latitude data of deletion
B in this step) the previous scanning strip in two scanning strips with the latitude data deletion of lap, and is recorded in the latitude data and the pairing line number of deleted data of deletion in another array;
D), linear interpolation correction
Utilize the latitude data of having deleted the last column that keeps behind the scanning strip of lap data in this step c), and the data of a back scanning strip first row, adopt linear interpolation to fill up the blank latitude data in deletion back;
Step 3: the correction of image edge abnormal image data
A), deletion superimposed image data
According to b in the step 2) result that searches directly finds out image data scope unusual in the adjacent scanning strip, and with superimposed image data deletion in the corresponding previous scanning strip, and with the deletion image data and the pairing line number of deleted data be recorded in another array;
B), distance weighted interpolation correction
Find out d in the step 2) c in the revised latitude data that obtain and the step 2 corresponding with it) the lap latitude data of the deletion of writing down, and the latitude data corresponding image data of the lap of deletion, find out latitude data with the most contiguous two deletions of revised latitude data, calculate the distance on this point and its most contiguous latitude at 2, and fill up the image data of deletion with distance weighted interpolation;
Step 4: search the overlapping region between adjacent image
A), Moderate Imaging Spectroradiomete image essential information is extracted
The Moderate Imaging Spectroradiomete image file name naming rule that utilization receives by digital broadcasting satellite system, from the filename of image, extract the essential information of MODIS image, the satellite designation that comprises lift-launch, the spatial resolution of image and the imaging time of image;
B), judge whether to exist adjacent image
Next imaging time in the same latitude of the satellite process area at Moderate Imaging Spectroradiomete place about 1 hour 30 minutes, the image of the video imaging time interval in 30 minutes can be defined as image adjacent on the time according to this, and image divided into groups, arrange according to the sequencing of imaging time;
C), the overlapping region searches
To the time go up two adjacent scape Moderate Imaging Spectroradiomete images, first row from imaging time image more early, according to scanning strip imaging sequencing, carry out the coupling of latitude data with scan lines all in another scape image, thereby find out identical all scan lines of image data, and determine the scope of overlay region between adjacent in time image;
D), finish to search
Step 5: the overlapping region is judged
Utilize c in the step 4) the overlapping region lookup result judged whether the overlapping region;
Step 6: the correction of image abnormal data
Respectively from an end of two adjacent scape Moderate Imaging Spectroradiomete image overlap areas, contrast the pixel of same position in proper order according to identical scanning strip, if wherein there is the value of the numerical exception of any one pixel and corresponding another pixel normal, then unusual pixel value is replaced, finish the correction of abnormal data, all finish comparison up to all scanning strips of all overlapping regions;
Step 7: the result is exported.
Searching and revising of the unusual latitude of described image edge data area is judgement and the correction of carrying out data exception unusually that only utilizes the latitude data; Because the MODIS sensor carries on AUQA and two satellites of TERRA, and the track difference of two satellites, the latitude data of AUQA satellite, the dull alternation of normal latitude data is characterized as monotone increasing on its column direction; The latitude data of TERRA satellite, the dull alternation of normal latitude data is characterized as monotone decreasing on its column direction; The correction of abnormal data directly on single-row direction, is found out the overlapping region of adjacent scanning strip, by the deletion and the linear interpolation of overlapping region unusual data is revised, and unusual image data is revised by distance weighted interpolation.
To search be MODIS file designation rule according to receiving by digital broadcasting satellite system (DVB-S) in the overlapping region between described adjacent image, extracts the satellite of lift-launch, the imaging time information of the spatial resolution of image and image; And with 30 minutes as adjacent on the judgement time, as to have the overlapping region image group criteria for classifying; According to the scanning strip order, search overlapping region between the image according to the two matching methods of latitude data and image data.
At hierarchy type file layout (Hierarchical Data Format), be among the HDF, the unit of data storage is the science data collection, and all data all are to divide according to certain logical order, as warp, latitude data set etc., leave different science data respectively in and concentrate.
The analysis of the present invention by all receiving stations of DVB-S system are distributed, find all to exist between each website range of receiving bigger overlapping, therefore can be by searching the pixel of the same name in the overlapping region between image, substitute abnormal data with normal pixel data, thereby realize quick, the accurately correction of a large amount of abnormal datas.
Description of drawings
Fig. 1 is a process flow diagram of the present invention
Fig. 2 is the position of DVB-S MODIS Data Receiving website of the present invention and the synoptic diagram of range of receiving
Fig. 3 is the synoptic diagram of embodiment of the invention overlapping region scope
Fig. 4 is the synoptic diagram before the correction of embodiment of the invention abnormal data
Fig. 5 is the revised synoptic diagram of embodiment of the invention abnormal data
Embodiment
Consult Fig. 1, the present invention is the modification method of abnormal data in a kind of remote sensing image, this method is utilized and is received the overlapping of data area between website, find out overlapping areas between adjacent image, and pixel point of the same name mated, substitute abnormal pixel value with normal pixel value wherein, realizing the accurate correction of abnormal data, it is specifically revised step and is:
Step 1:MODDIS image data 10 read and the longitude and latitude data read 20
Function in the MODIS image data 10 main use hierarchy type file layout class libraries carries out reading of all data of MODIS, and the function of its step and use is as follows:
A), open hierarchy type file layout file and initialization SD (SDstart) interface 21;
The science data set name that b), will read claims (name as the latitude data set is called Latitude) to be converted to the call number (SDnametoindex) 22 of data set;
C), open corresponding science data collection (SDselect) 23 according to the call number of data set;
D), the initial sum final position 24 that reads of setting data collection, if the data set that reads is cube (more than the one dimension), then to defines by the reference position of read data collection and final position (start, edge), otherwise needn't specify;
E), the information (SDreaddata) 25 of reading of data collection, if what read is the longitude and latitude data, then, leave in the row and column of two-dimensional array correspondence the data that read position according to scan line and scan columns correspondence;
F), the visit of end data collection (SDendaccess) 26;
G), judge whether to run through all data designated collection 27;
H), finish the SD interface, close hierarchy type file layout file (SDend) 28;
Step 2: the unusual latitude of image edge data area search and revise 30
A), press scanning strip and divide latitude data 31
With the latitude data that leave in the two-dimensional array, since first row, be unit with the shared pixel of single scanning strip on the single-row direction, be unit promptly with 10 pixels, the latitude data of these row are divided;
B), search overlapping latitude data 32
According to the order of scanning strip, from the latitude data array of having divided, extract the latitude data of two adjacent scanning strips successively, contrast and find out the lap of latitude data between two scanning strips, this lap promptly is the scope of abnormal data;
C), the overlapping latitude data 33 of deletion
Previous scanning strip in two scanning strips of this step b), with the latitude data deletion of lap, and with the deletion latitude data and the pairing line number of deleted data be recorded in another array;
D), the linear interpolation correction 34
Utilize in this step c), deleted the latitude data of the last column that keeps behind the scanning strip of lap data, and the data of a back scanning strip first row, utilize approach based on linear interpolation to fill up the blank latitude data in deletion back;
Step 3: the correction 40 of image edge abnormal image data
A), deletion superimposed image data 41
Because in the MODIS grid image data, there are relation one to one in the image data of single lattice point and latitude data, thereby unusual latitude data corresponding image data also exist unusually, can utilize this corresponding relation, according to b in the step 2) result that searches directly finds out image data scope unusual in the adjacent scanning strip, and with superimposed image data deletion in the corresponding previous scanning strip, and with the deletion image data and the pairing line number of deleted data be recorded in another array;
B), distance weighted interpolation correction 42
Find out d in the step 2) c in the revised latitude data that obtain and the step 2 corresponding with it) the lap latitude data of the deletion of writing down, and the latitude data corresponding image data of the lap of deletion, find out latitude data with the most contiguous two deletions of revised latitude data, calculate the distance on this point and its most contiguous latitude at 2, and fill up the image data of deletion with distance weighted interpolation;
Step 4: the overlapping region searches 50 between adjacent image
A), MODIS image essential information extracts 51
The DVB-S MODIS image file name naming rule that utilization receives is extracted the essential information of MODIS image from the filename of image, comprise the satellite designation of lift-launch, the spatial resolution of image and the imaging time of image;
B), judge whether to exist adjacent image 52
Next imaging time in the same latitude of the satellite process area at MODIS place about 1 hour 30 minutes, the image of the video imaging time interval in 30 minutes can be defined as image adjacent on the time according to this, and image divided into groups, arrange according to the sequencing of imaging time;
C), the overlapping region searches 53
Because in the overlapping region, the latitude data and the image data of image are all identical, can utilize through the MODIS data after unusual latitude data of image edge and the image data processing, to the time go up adjacent MODIS image, first row from imaging time image more early, according to scanning strip imaging sequencing, go up the coupling that scan lines all in another adjacent scape image carries out the latitude data with the time, thereby find out identical all scan lines of image data, and determine the scope of overlay region between adjacent in time image;
D), finish to search 54
Step 5: the overlapping region judges 60
Utilize c in the step 4) the overlapping region lookup result judged whether the overlapping region;
Step 6: the correction 70 of image abnormal data
Respectively from an end of two adjacent scape MODIS image overlap areas, contrast the pixel of same position in proper order according to identical scanning strip, if wherein there is the value of the numerical exception of any one pixel and corresponding another pixel normal, then unusual pixel value is replaced, finish the correction of abnormal data, all finish comparison up to all scanning strips of all overlapping regions;
Step 7: the result is exported 80.
Embodiment
Consult Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the MODIS image of imaging time on June 4th, 2008 about 6 o'clock carried out the abnormal data correction, the MODIS data of choosing are MODIS data that come from the AQUA satellite that Guangzhou, Beijing and the ground receiving station, Urumchi in the DVB-S system receives, and selecting spatial resolution for use is the image of 1KM.According to process flow diagram of the present invention, abnormal data in three width of cloth images is revised, read the image data and the corresponding longitude and latitude data of these websites through step 1, the revised law that provides of step 2 and step 3 then, the latitude data that the data edge is unusual are revised according to linear interpolation method, and simultaneously corresponding unusual image data is revised according to distance weighted method of interpolation, find out the overlapping region between adjacent image then, and from the filename of MODIS file, extract basic image information, the satellite that comprises lift-launch, the spatial resolution of image and the imaging time of image, the MODIS image file that Guangzhou Railway Station receives among embodiment AQUA_2008_06_04_05_48_GZ.MOD021KM.hdf by name, in this file example by name with this document, the method of image data essential information is extracted in explanation from filename, the satellite designation that character from file " AQUA " extracts the lift-launch of MODIS sensor is AQUA, from filename character " 1KM ", the spatial resolution that obtains this image is 1 kilometer, extracts this video imaging time from filename character " 2008_06_04_05_48 " and starts from 5: 48 on the 4th June in 2008.Calculate the different images imaging time time at interval from the video imaging that extracts, to at interval in 30 minutes, all be divided into one group, carry out the correction of abnormal data, find out the overlapping region (shown in Figure 4) between adjacent image at last, simultaneously since an end of two scape MODIS image overlap areas, the identical pixel in position in the comparison scanning strip substitutes unusual pixel value with normal pixel value, and the pixel in all overlapping regions is all compared and finished.Image contrast before and after abnormal data is proofreaied and correct as shown in Figure 4 and Figure 5.
Table-1: Moderate Imaging Spectroradiomete MODIS important technological parameters
Table-1?Main?parameters?of?the?MODIS?instrument
Find according to data-searching, the modification method of existing abnormal data adopts space interpolation or temporal interpolation method mostly, and the data that obtain after the correction are not the real value that sensor receives, and for the larger area abnormal data, this kind method all can't solve.For this reason, the present invention adopts between DVB-S system receiving station range of receiving and has overlapping areas, and the identical characteristics of the value of lap, carries out the correction of MODIS data.And can revise multiple abnormal data (image data, longitude and latitude data) simultaneously.
At on June 4th, 2008 imaging time about 6 o'clock, carry out the processing of image abnormal value by the data of Guangzhou, three websites in Beijing and Urumchi.By utilizing the inventive method to handle image effect figure later as can be seen, the present invention can be good at the abnormal data that exists in other image is revised, and correction effect is good, and method is simple, carries out the efficient height.
Claims (3)
1. the modification method of a Moderate Imaging Spectroradiomete 1B level remote sensing image abnormal data is characterized in that this method comprises following concrete steps:
Step 1: the reading of Moderate Imaging Spectroradiomete image data and longitude and latitude data
Use function in the hierarchy type file layout class libraries to carry out reading of all data that Moderate Imaging Spectroradiomete obtains, carry out according to the following steps:
A), open hierarchy type file layout file and initialization interface;
The science data set name that b), will read claims to be converted to the call number of data set;
C), open corresponding science data collection according to the call number of data set;
D), definition is by the reference position of read data collection and final position;
E), the information of reading of data collection, the data that the read order according to scan line and scan columns correspondence is left in the row and column of two-dimensional array correspondence;
F), the visit of end data collection;
G), judge whether to run through all data sets;
H), finish interface, close hierarchy type file layout file;
Step 2: the searching and revising of the unusual latitude of image edge data area
A), cut apart the latitude data by scanning strip
With the latitude data that leave in the two-dimensional array, since first row, be unit with the shared pixel of single scanning strip on the single-row direction, be unit promptly with 10 pixels, the latitude data of these row are divided;
B), search overlapping latitude data
According to the order of scanning strip, from the latitude data array of having divided, extract the latitude data of two adjacent scanning strips successively, contrast and find out the lap of latitude data between two scanning strips, this lap promptly is the scope of abnormal data;
C), the overlapping latitude data of deletion
B in this step) the previous scanning strip in two scanning strips with the latitude data deletion of lap, and is recorded in the latitude data and the pairing line number of deleted data of deletion in another array;
D), linear interpolation correction
Utilize the latitude data of having deleted the last column that keeps behind the scanning strip of lap data in this step c), and the data of a back scanning strip first row, adopt linear interpolation to fill up the blank latitude data in deletion back;
Step 3: the correction of image edge abnormal image data
A), deletion superimposed image data
According to b in the step 2) result that searches directly finds out image data scope unusual in the adjacent scanning strip, and with superimposed image data deletion in the corresponding previous scanning strip, and with the deletion image data and the pairing line number of deleted data be recorded in another array;
B), distance weighted interpolation correction
Find out d in the step 2) c in the revised latitude data that obtain and the step 2 corresponding with it) the lap latitude data of the deletion of writing down, and the latitude data corresponding image data of the lap of deletion, find out latitude data with the most contiguous two deletions of revised latitude data, calculate the distance on this point and its most contiguous latitude at 2, and fill up the image data of deletion with distance weighted interpolation;
Step 4: search the overlapping region between adjacent image
A), Moderate Imaging Spectroradiomete image essential information is extracted
The Moderate Imaging Spectroradiomete image file name naming rule that utilization receives by digital broadcasting satellite system, from the filename of image, extract the essential information of MODIS image, the satellite designation that comprises lift-launch, the spatial resolution of image and the imaging time of image;
B), judge whether to exist adjacent image
Next imaging time in the same latitude of the satellite process area at Moderate Imaging Spectroradiomete place about 1 hour 30 minutes, the image of the video imaging time interval in 30 minutes can be defined as image adjacent on the time according to this, and image divided into groups, arrange according to the sequencing of imaging time;
C), the overlapping region searches
To the time go up two adjacent scape Moderate Imaging Spectroradiomete images, first row from imaging time image more early, according to scanning strip imaging sequencing, carry out the coupling of latitude data with scan lines all in another scape image, thereby find out identical all scan lines of image data, and determine the scope of overlay region between adjacent in time image;
D), finish to search
Step 5: the overlapping region is judged
Utilize c in the step 4) the overlapping region lookup result judged whether the overlapping region;
Step 6: the correction of image abnormal data
Respectively from an end of two adjacent scape Moderate Imaging Spectroradiomete image overlap areas, contrast the pixel of same position in proper order according to identical scanning strip, if wherein there is the value of the numerical exception of any one pixel and corresponding another pixel normal, then unusual pixel value is replaced, finish the correction of abnormal data, all finish comparison up to all scanning strips of all overlapping regions;
Step 7: the result is exported.
2. modification method according to claim 1, it is characterized in that the unusual latitude of described image edge data area to search and revise be judgement and the correction of carrying out data exception unusually that only utilizes the latitude data; The correction of abnormal data directly on single-row direction, is found out the overlapping region of adjacent scanning strip, by the deletion and the linear interpolation of overlapping region unusual data is revised, and unusual image data is revised by distance weighted interpolation.
3. modification method according to claim 1, it is characterized in that search overlapping region between described adjacent image is the Moderate Imaging Spectroradiomete image file naming rule that receives according to by digital broadcasting satellite system, from filename, extract the satellite that carries, the imaging time information of the spatial resolution of image and image; And with 30 minutes as adjacent on the judgement time, as to have the overlapping region image group criteria for classifying; According to the scanning strip order, search overlapping region between the image according to the two matching methods of latitude data and image data.
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| CN104809238A (en) * | 2015-05-12 | 2015-07-29 | 国家电网公司 | Data processing method and data processing device for data acquisition system |
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Non-Patent Citations (3)
| Title |
|---|
| 《IEEE Transaetionson Geoscience and Remote Sensing》 19981231 Robert E Wolf，David P Roy，E.Vermote MODIS Land Data Storage，Gridding，and ComPositing Methodology:Level 2 Grid 1324-1338 1-3 第36卷, 第4期 * |
| 《遥感学报》 20040331 蒋耿明; 刘荣高; 牛铮; 庄大方 MODIS 1B影像几何纠正方法研究及软件实现 158-163 1-3 第8卷, 第2期 * |
| 《遥感技术与应用》 20030630 郭广猛 非星历表法去除MODIS图像边缘重叠影响的研究 172-175 1-3 第18卷, 第3期 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104809238A (en) * | 2015-05-12 | 2015-07-29 | 国家电网公司 | Data processing method and data processing device for data acquisition system |
| CN104809238B (en) * | 2015-05-12 | 2018-02-23 | 国家电网公司 | Data processing method and device for data collecting system |
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