I'm looking to do analysis on cities throughout the world. I'm using WorldPop, LandScan and MODIS data to gain urban extent and population density maps. I would like to extract areas which have a population size above 100,000. At the moment I think I may have to manually go through each city which has a population of above 100,000 and clip around this to create a new layer, is there another way around this?
I'm using ArcGIS 10.2.2.
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1Welcome to GIS SE. Please edit your question to include the GIS software you are using (including version), and clarify the procedure you think you need to use. Not much is done "manually" in GIS.– VinceCommented Jun 23, 2015 at 11:25
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Thanks Vince, sorry I'm new to asking questions on here, hope the edits I've made helps.– jessica1102Commented Jun 23, 2015 at 11:48
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put a definition query to show only cities that have population above 100,000.– user54245Commented Jun 24, 2015 at 16:02
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1 Answer
You need a query to select by attributes, and then run your analysis on those selected. Open up the attribute table of the layer that has population information, and note the variable name. Then "Select by Attribute", select the population variable, and type in >100,000. (This is a SQL query; Python is also possible but not necessary for what you're doing.) All the points (=cities) with populations over 100,000 will be highlighted. You can then go back to the layer in your table of contents, right click, and either export as a new shapefile or save as a data layer.
http://resources.arcgis.com/en/help/main/10.1/index.html#//00s500000021000000
