Orthophoto Preparation

ORTHOPHOTO PREPARATION

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Objective

Creation of Orthophotos and topographic map preparation

Description:

Satellite images of adjacent land areas (Scale: 1:30,000) were merged, grey scale adjusted and different land cover types were classified. AABSyS created an ortho-photo (composite image) from four satellite images (in TIFF format). The four images were merged with a minimum loss of contrast, the grey scale was adjusted and minor mismatched at the edges were fine-tuned. The same gray scale was maintained across the composite image so that different land types such as forest, agriculture, urban are easily distinguishable. Different land cover types were classified such as forests, urban and rural settlements, highways, main roads, side roads, buildings, rivers, trenches, railway tracks, TV towers, windmills, electric lines, trees, parks, fields, cultivated lands. Different land classifications were shown as area objects in different polygons. The work was performed using ERDAS Imagery software. The ortho-photo image was delivered in TIFF format, and the vectorized land classification file was delivered in Arcview SHP format and AutoCAD DXF format.

Conversion Method

Heads up digitization

Techniques

Orthophoto Preparation using ERDAS Imagery Digitization on Raster image

Final Product &Usage

The final product is used for making maps & retrieving information regarding topography , landforms and for study of vegetation, forestry , growth of settlements (rural & urban)