A kind of remote sensing method of telemetering of beach wetland landform Quick Measurement
Technical field
The present invention relates to a kind of topographic survey method, particularly relate to a kind of remote sensing method of telemetering of beach wetland landform Quick Measurement.
Background technology
True ground of traditional topographic survey method measuring method based on transit and modern total powerstation, it to the topographic technology path in region be by point to line again to the topographic survey method of face.Field survey operating condition is arduous, and efficiency is low, and financial resources consumption is large.
Bathymetric surveying is mainly that boat-carrying tester is measured.Bank region, rivers,lakes and seas shore beach blazons, and beach topographical surveying is a difficult problem for a long-term puzzlement, " beach in boat measurement difficulty, people surveys difficult lower water ".Boat-carrying is measured underwater topography method and is subject to boats and ships to need the just voyageable restriction of the enough depth of water (drinking water), and survey ship can not go deep into shallow water beach and measure.The beach depth of water is shallow slow, the especially beach of fluctuation of water table, and as the beach of tidal effect, manpower is measured current difficulty on foot, and beach mud is dark, beach falls into, groove is changeable, not only measures inefficiency, and has the person and device security risk.Thereby large area beach lacks actual measurement topographic(al) data for a long time, as the mud flat of Jiangsu off coast.
Photogrammetric is to be based upon atural object photogra to the optical image measuring method on basis.The method is suitable for the mountain and hill topographical surveying that topographic relief is larger, but beach wetland landform is very mild difficult, is difficult to form effective stereoscopic photograph picture pair, is unwell to beach wetland topographical surveying.
Airborne laser is surveyed and range measurement system technology (LiDAR) can obtain beach terrain information (Guo Q H on a large scale fast
et al., 2010), Blott etc. use LiDAR data construct DEM(Blott S J at Britain Abbotts Hall seashore
et al., 2004); But LiDAR technology is subject to the differences such as beach vegetation, quality, weather when testing and tidal conditions, and the multiple measurement factor such as production cost restriction, beach dynamically need aspect observation and historical development research a kind of large area synchronously, the method for Quick Measurement, LiDAR is still difficult to bring into play the effect of its long Serial monitoring.
Tidal flat landform inversion method achievement in research based on remote sensing flowage line is rich, and its principle is using flowage line as the altitude gauge of measuring tidal flat region elevation, and the horizontal level of land and water boundary line determines by flowage line, and vertical height information is from the tidal height in imaging moment.Use flowage line extracting method to extract flowage line, calculate Instantaneous Sea Level height in conjunction with dynamic model or measured profile data, can build tidal flat digital terrain (Mason D C
et al., 1995,1997,2001; Ryu J H
et al., 2002; White K
et al., 1999; Han Zhen etc., 2005; Zheng Zongsheng etc., 2008).Forefathers often adopt the profile data of Hydrodynamic Model or actual measurement to carry out flowage line elevation assignment, for the tidal flat region of large-area shortage underwater topography data, the precision of Hydrodynamic Model simulation is not high, and artificial measured profile often can not meet large-scale assignment needs, the terrain error that therefore these two kinds of assignment methods obtain is all relatively large.In addition, not integrated synchronous water-level observation system of this type of flowage line method, the terrain data of inverting can be used for beach evolution analysis, has exercisable beach Geography monitor method system but be not enough to develop into.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of remote sensing method of telemetering of beach wetland landform Quick Measurement, integrated Modern Satellite remote sensing and hydrological telemetry, large area remote sensing Simultaneous Monitoring is combined with continuous water level remote measuring system, the elevation information integrated approach of water-level observation baseline and remote sensing flowage line has been proposed, two-dimentional remote sensing image data is converted into three beach terrain informations, sets up the method for fast measuring of the shore such as rivers,lakes and seas and reservoir seashore painting wetland landform.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A remote sensing method of telemetering for beach wetland landform Quick Measurement, comprises the following steps:
Step 1, determines scope and the monitoring time scope of monitoring beach wetland and relevant waters thereof;
Step 2, in monitored area, set up plural water level telemetering station, according to each waters hydraulic connection feature, longitudinally build water level telemetering station net and the water-level observation baseline of Real-Time Monitoring along monitored area simultaneously, extract the observation water bit line of different time on water-level observation baseline; Described water-level observation baseline is formed by the connection broken line at more than two water level telemetering station, and described observation water bit line is the on line of the measured water level data at the each water level telemetering station based on along water-level observation baseline, adopts the matching of splines interpolation method to form; All longitudinally totally parallel with remote sensing flowage line of the trend of described water-level observation baseline and observation water bit line;
Step 3, collects the multi-source multidate satellite remote-sensing image data of monitored area, and extracts two-dimentional remote sensing flowage line;
Step 4, the assignment method that adopts space to close on, waterside point on every remote sensing flowage line is made to vertical line to the observation water bit line of time synchronized, and the water level value of observation water bit line intersection point is assigned to corresponding remote sensing waterside point, the elevation information that completes one group of simultaneous observation waterline and remote sensing flowage line is integrated, by that analogy every two-dimentional remote sensing flowage line is converted into 3 D Remote Sensing flowage line, thereby obtains serial 3 D Remote Sensing flowage line;
Step 5, adopts Spatial Interpolation, according to serial 3 D Remote Sensing flowage line, builds beach wetland digital terrain model, generates the digital terrain of tested beach wetland;
Step 6, utilize the terrain data of actual measurement recently in monitored area, adopt the control methods of population mean elevation, in overlapping survey district or overlapping section, to the beach digital terrain of remote sensing remote measurement with recently survey landform and carry out accuracy test, finally complete the beach wetland topomap of monitored area.
The present invention adopts above technical scheme, the non-field survey technical method that adopts remote sensing remote measurement to combine, integrated Modern Satellite remote sensing and hydrological telemetry, solved the dimensional topography elevation information in beach terrain remote sensing image, can obtain centimetre-sized beach landform altitude information; Compared with prior art, can thoroughly solve traditional manually measure on foot, the measurement difficulty of shipborne radar field survey and modern Aviation radargrammetry, overcome LiDAR measurement simultaneously and be subject to the difficult problem such as restriction of weather and blank pipe.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is the concrete implementing procedure figure as an example of Sandbanks in submarine radial sand ridges region, Jiangsu beach example.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of remote sensing method of telemetering of beach wetland landform Quick Measurement, comprises the following steps:
Step 1, determines scope and the monitoring time scope of monitoring beach wetland and relevant waters thereof;
Step 2, in monitored area, set up plural water level telemetering station, according to each waters hydraulic connection feature, longitudinally build water level telemetering station net and the water-level observation baseline of Real-Time Monitoring along monitored area simultaneously, extract the observation water bit line of different time on water-level observation baseline; Described water-level observation baseline is formed by the connection broken line at more than two water level telemetering station, and described observation water bit line is the on line of the measured water level data at the each water level telemetering station based on along water-level observation baseline, adopts the matching of splines interpolation method to form; All longitudinally totally parallel with remote sensing flowage line of the trend of described water-level observation baseline and observation water bit line;
Step 3, collects the multi-source multidate satellite remote-sensing image data of monitored area, and extracts two-dimentional remote sensing flowage line;
Step 4, the assignment method that adopts space to close on, waterside point on every remote sensing flowage line is made to vertical line to the observation water bit line of time synchronized, and the water level value of observation water bit line intersection point is assigned to corresponding remote sensing waterside point, the elevation information that completes one group of simultaneous observation waterline and remote sensing flowage line is integrated, by that analogy every two-dimentional remote sensing flowage line is converted into 3 D Remote Sensing flowage line, thereby obtains serial 3 D Remote Sensing flowage line;
Step 5, adopts Spatial Interpolation, according to serial 3 D Remote Sensing flowage line, builds beach wetland digital terrain model, generates the digital terrain of tested beach wetland;
Step 6, utilize the terrain data of actual measurement recently in monitored area, adopt the control methods of population mean elevation, in overlapping survey district or overlapping section, to the beach digital terrain of remote sensing remote measurement with recently survey landform and carry out accuracy test, finally complete the beach wetland topomap of monitored area.
As shown in Figure 2, take Sandbanks in submarine radial sand ridges region, Jiangsu beach as example, technical scheme of the present invention is described in further detail:
1, the scope in definite monitoring beach wetland and relevant waters thereof is Jiangsu Sandbanks in submarine radial sand ridges beach, and monitoring time is 2013;
2, according to 6 water level telemetering stations in one's respective area, along longitudinally building water-level observation baseline and water level telemetering station net in region; According to water-level observation baseline (from shining sun river mouth, through strip mud, to oyster Ya mountain), adopt the matching of splines interpolation method, set up the observation water bit line of different time;
3, collect monitored area more than the 100 width HJ/TM multi-source multidate satellite remote-sensing image data in year April in October, 2012 to 2013, adopt the object-oriented space characteristics extraction module in ENVI to extract 35 remote sensing flowage lines;
4, waterline and the remote sensing flowage line on the synchronous observation base of select time done integrated pairing (35 groups), the assignment method that adopts space to close on, each waterside point on 35 remote sensing flowage lines is made to vertical line to the observation water bit line of time synchronized, and the water level value of intersection point is assigned to corresponding waterside point, the elevation information that completes 35 groups of simultaneous observation waterlines and remote sensing flowage line is integrated, obtains 35 3 D Remote Sensing flowage lines;
5, according to 35 3 D Remote Sensing flowage lines, in ArcGIS software, adopt Spatial Interpolation, build digital terrain model, generate 3300km
2the digital terrain of radiation dune ridge group tidal flat;
6, utilize the actual measurement topomap of strip mud region 1:1 in 2012 ten thousand, 1:5 ten thousand in 2009, the digital terrain generating is carried out to accuracy test, finally obtain Sandbanks in submarine radial sand ridges region, the Jiangsu beach topomap that landform spatial resolution is equivalent to 1:1 ten thousand plotting accuracies.
The above; it is only the embodiment in the present invention; but protection scope of the present invention is not limited to this; any people who is familiar with this technology is in the disclosed technical scope of the present invention; can understand conversion or the replacement expected; all should be encompassed in of the present invention comprise scope within, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.