I have a GIS map of pipes and each Pppe has an Index. How can I zone the map based on the assigned index of pipes in GIS?
Yuo want to give the index value of pipe to a certain area. And the area without pipes? Do you want to give them value = 0?
Hi Zahra,
If you're trying to partition or tessellate the space based on areas that are each identified by the closest pipe, you're doing a kind of nearest-neighbor interpolation. This is usually implemented for point data (e.g., imagine the pipes as points), and that's how you'll find algorithms like Nearest Neighbor and Thiessen Polygons (= Voronoi Polygons) implemented in most GIS.
One way to approximate that is to rasterize your data, so that the pipes are represented as pixels with the corresponding id number. Then, you perform Euclidean Allocation (see http://resources.arcgis.com/en/help/main/10.2/index.html#//009z0000001m000000) to get a raster surface that classifies each pixel according to the closest source (i.e. pipe id) pixel. You can then polygonize that raster, one polygon for each raster region (a region being a contiguous mass of pixels of uniform value). You just have to make sure you use small-enough pixels to capture the level of precision you need in terms of distance.
Hope that helps, cheers :)
P
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