#RASTER TOPOGRAPHIC MAPS ISO#
Unfortunally, gdal_contour generates vertor iso lines, which are not suitable. Gdal_contour -a elev -fl -500 -200 0 4000 crop.tif contours.shp The pixels in a raster map are typically. New Elevation Data Available Statewide for Alaska In 2011 the Alaska Congressional Delegation requested federal support to modernize Alaska map data. Using the libs curl, unzip, gdal, my current worflow is as follow. Raster maps are commonly used to display satellite imagery, topographic maps, and other types of geographic data. The new data and maps raise the accuracy of Alaska topographic mapping to levels found common in the conterminous United States. I currently crop my source raster ETOPO using gdal_translate then get levels with gdal_contour. Current workflow: gdal_contours alone is not suitable. The main OpenTopoMap is a online rendered raster map. If you are interested in building your own OpenTopoMap, see the beginners guides for a tile server and for Garmin files.
#RASTER TOPOGRAPHIC MAPS HOW TO#
I haven't clues how to do that, but it sound promising! (should work) If you can provide the solution to one of the points 2, 3, 4, It will be really appreciated ! and I will be happy to then open a specific question where I will validate your helpful answer.ģ. OpenTopoMap is a topographic map out of data from OpenStreetMap and SRTM. (merge this polygons into one shp layer of level_n.).Keep those of these polygons with a value (altitude) superior to the isoline value.Cut this polygon with all isolines of level n (i.e.shp should be made of closed polygons for each of the n requested level.Ĭreate vector isolines ( gdal_contour -a elev -fl -500 2000 4000 crop.tif contours.shp)Ĭreate a copy of the whole map area into vector polygon, Using commands (likely gdal) and a GIS topographic raster image, I want to produce topographic. How to convert raster topographic image into closed vector polygons for the relevant levels as seen in the illustration below ? Welcome We offer topographic maps issued by military and state agencies of Europe, US, Russia in the 19-20th centuries.How to create vector topographic maps from raster image ?.(nb:This project is part of the #Wikipedia #wikimaps project)
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