基于圓跡SAR的建筑物輪廓信息提取
doi: 10.11999/JEIT140717
基金項(xiàng)目:
國(guó)家自然科學(xué)基金青年基金(61201404)和國(guó)家自然科學(xué)基金面上項(xiàng)目(61372186)資助課題
An Approach of the Outlines Extraction of Building Footprints from the Circular SAR Data
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摘要: 利用圓跡SAR對(duì)目標(biāo)的全方位觀測(cè)的特點(diǎn)，該文提出一種基于圓跡SAR數(shù)據(jù)的建筑物輪廓信息提取以及所處地面的高度估計(jì)的方法。首先，通過(guò)雷達(dá)立體測(cè)量的方法粗估計(jì)出目標(biāo)建筑物所處地面的海拔高度。然后，以該高度為基準(zhǔn)上下一定范圍內(nèi)劃分多個(gè)成像平面層，在各個(gè)成像平面上對(duì)建筑物進(jìn)行圓跡SAR成像。最后，在圓跡SAR圖像中選擇建筑物二次反射亮線構(gòu)成封閉線框的一副圖像，從該幅圖像中提取建筑物在水平面的輪廓信息，同時(shí)將該圖像對(duì)應(yīng)的成像平面高度確定為目標(biāo)建筑物所在地面的高度。P波段機(jī)載圓跡SAR實(shí)測(cè)數(shù)據(jù)驗(yàn)證了該方法的有效性。Abstract: Take the advantage of all-directional observation of circular SAR, an approach of the outlines extraction of building footprints from the circular SAR data is presented, while the approach can also be used for estimating the ground altitude around the building. The proposed approach is as follows: firstly, the rough altitude of the ground around the building is estimated by radargrammetric Digital Elevation Model (DEM) extraction, secondly, image planes are set in certain range where the estimated altitude is in the middle, and circular SAR image of the building is obtained on each image plane. Finally, one image is selected where a closed polygon frame is formed by the double bounce scattering bright lines from the building, and the outlines of building footprints are extracted from the image, while the altitude corresponding to the imaging plane is defined as the altitude of the ground around the target building. The proposed method is validated by the circular SAR data processing by the experimental SAR airborne system at P bands.
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Key words:
- Circular SAR /
- Outlines of building /
- Information extraction /
- Double bounce scattering
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