topic Re: Re Project in Data Management Questions

Re Project

RajatPali — Sat, 23 Nov 2013 07:59:58 GMT

Hi,

It will be a great help if anyone can suggest me a process or automation/tool to re project a raster in jpeg format by taking the projection values and coordinate system from a preexisting raster which exist in .img format. The reason of asking the needful is as both the images are of the same area but are opening at different location. The .img format is having the correct parameters.

regards
rajat

Re: Re Project

NidhinKarthikeyan — Sun, 24 Nov 2013 18:07:52 GMT

You can use Model Builder or Python script. Loading the control point of .img might work.

Re: Re Project

SachinKanaujia — Mon, 25 Nov 2013 15:29:45 GMT

I am not sure what exactly you are trying to do, because if the image image is correctly projected you should not need to do a translate. Are you trying to georeference the image? Anyway I will provide same quick snippets of accomplishing both (via python)

1) Getting spatial reference
raster = arcpy.Raster(rasterPath)
sourceSR = raster.spatialReference # reading spatial reference from Raster

or
sourceSR = arcpy.SpatialReference(srCode) # if you know the code

2) Getting source points
_minX = raster.extent.XMin
_minY = raster.extent.YMin
_maxX = raster.extent.XMax
_maxY= raster.extent.YMax

3) Creating control points (you can create source and target accordingly)
source_control_points = "'" + str(_minX) + " " + str(_maxY) + "';'" + str(_maxX) + " " + str(_maxY) + "';'" + str(_maxX) + " " + str(_minY) + "';'" + str(_minX) + " " + str(_minY) + "'"

4) Georeferencing
arcpy.Warp_management(img_path, source_control_points, target_control_points, out_raster, "POLYORDER1","NEAREST")

I hope this helps !!!