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  1. Hello all, I want to study the visibility of wind mills or the areas of land which can see the tall wind mills. I know the locations of the wind mills. I just need to check which all places on the land can see the windmill. I have the dem raster file of the terrain. I also have tree heights and building heights in the study area. When i use the viewshed tool, it asks for raster file which is the dem file and then observer points. In this case what are the observer points ? Thanks , Maaya
  2. Hello again, Does someone know how to use OWA or ordered weighted averaging method in GIS as a multi criteria method? Thanks, Maaya.
  3. A basic question here What are the differences between spatial analyst and 3d analyst tools? I see tools in these two formats for example : Hillshade available as 3d and spatial analyst. Which is best and when is it to be used? Thanks Maaya
  4. Hello all, Can someone help me with the multi criteria evaluation to select a suitable site for wind farms using TOPSIS in GIS? I see mostly AHP method being used to find weights of factors, i want to use some other method instead of AHP to find factor weights. Please add in your suggestions :) Thanks in advance, Maya
  5. Thanks Elman Mosaic to new raster also worked for me. I ll try this one too Thanks again, Maaya
  6. Hello, I need to combine two overlapping raster layers. I would like the resulting map to get the values such that it takes the higher values from any of those two layers. For example:If one map has a value of 0.8 and other has 0.1 at same point then i would like the final map to get a value of 0.8 from the first map. How could this be done in arcmap? Can someone help me with it? Thanks a lot, Maaya
  7. Hello all, I am trying viewshed in ArcMap 10.3.1. The tool actually worked so fast before last two days and now it has slow down and it takes more than 12 hours to reach the results. Why is it so? Did someone have this problem with Viewshed tool? What could be the reasons for slowing down? How to fix this? Thanks for the help, Maya
  8. Thank you so much. It helped Now i am stuck with a new problem. The view shed tool is taking too much time to run. In th begining the tool run so fast but now its taking around 12 hours to run with the same input files. DO you have any idea why? Thanks, maya
  9. Hello, I want to do a viewshed of tall towers. Trees height data are also available. How to take into account the height of trees when doing viewshed analysis ? thanks, maaya
  10. Hello all, I want to add wind mill tower heights to the existing dem file at some places. How could this be done? Thanks for the help, Maya
  11. Hello all, I am working with software TerrSet. How is it possible to export some values by selecting within a map. I dont want to consider industrial areas in a landcover map. So i want a map without industries from a landcover. Can someone tell me how is that done? I have worked with ArcMap where we can just select the features from the attribute table and export the map with the selected features. Is there any option like that in here? Thanks, maaya
  12. I read in some instructions that it is safer to reclassify with codes like value in the reclass dialogue box instead of fields like ex: Geology . Is it because there are more possibility for errors in this than in the values. I find it more easier to reclassify if it is based on descriptions like geology. Are there some other reasons that reclassification works better with values than with fields like descriptions? Thanks, Maya.
  13. Hello Lurker, Surprisingly it worked after closing the program and restarting. Thanks a lot, Maya

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