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making maps with srtm and etopo data sets into desired

June 30 2010 | 0 comments
Categories: Map Data

dear sir

i would like to process srtm30 and etopo5 data sets in to the follwing outputs

1. topographical maps with all types like hillshade/shaded relief / elevation / illumination / contour lines with labels ..etc

2. using srtm30 and etopo5 data ..making bathymetry in the ocean side and shaded relif on the land part with all contours with labels and desired color coding for each contours and land sea differentiation..etc.

3. costal data plotting on the maps for industrial services like pipeline route plotting etc..

please explain me in step by step procedure to do all these processing ( srtm and etopo data downloaded )in Arcmap ( arcgis 9.2 version).

answer in quick time is highly appreciated .

thanks in advance

Mapping Center Answer:

Here are some answers:

1. First, hillshade, shaded relief, and illumination are pretty much the same (although illumination analysis is slightly different for analytic not cartographic purposes) -- the tool to use is Hillshade -- it is in the Surface toolset of the Spatial Analyst toolbox on ArcToolbox.  The Contour tool is also located here.  You can use this to create your contours. Labeling contours is a little trickier.  We have a white paper that discusses this and other subject related to contours here on Mapping Center on the Other Resources - Publications page.

2. When you use the tools I noted in the answer above, the functions work on both the bathymetric data and the land elevation data, so you will also get the bathymetric hillshade and bathymetric contours when you use them.  Coloring the land areas differently than the ocean areas is a little trickier.  If you do not use a color map, which is a more advanced symbolization technique, then the easiest way to make sure you are correctly coloring each (the land and the ocean areas) is to create a new raster from the input data (either SRTM or ETOPO5) for each.  You can do this using the Extract by Mask tool in the Extraction toolset of Spatial Analyst.  Then you simply apply the color ramp that is appropriate for water depths to the output ocean raster, and a land elevation color ramp to the output land raster .  We have some wonderful color ramps for both on our ArcGIS Resources - Styles page here on Mapping Center.

3. I am not really sure what you are asking about in your last question.  If you have pipeline locations in a GIS format, then they should overlay the data correctly, provided the projections for all data are correctly defined.

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