tag:blogger.com,1999:blog-34248307.post7570761645618388408..comments2023-10-25T12:37:00.910-04:00Comments on GIS @ HigherEd: How to Measure Area in ArcMapMeghttp://www.blogger.com/profile/06416614287949114736noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-34248307.post-90044277411814064032009-05-17T18:48:00.000-04:002009-05-17T18:48:00.000-04:00Dear Brian,
With ArcMap 9.1 we used XTools. See ...Dear Brian,<br /><br />With ArcMap 9.1 we used XTools. See if it is still available for the older version of Arc (it usd to be free for a limited time)<br />http://www.xtoolspro.com/<br />and<br />http://gisatvassar.blogspot.com/2006/10/calculating-area-in-arcmap-why-should.html<br /><br />Good luck!<br />MegMeghttps://www.blogger.com/profile/06416614287949114736noreply@blogger.comtag:blogger.com,1999:blog-34248307.post-43352057462254561842009-05-15T13:47:00.000-04:002009-05-15T13:47:00.000-04:00I am using ArcMAP 9.1 and need to get the areas of...I am using ArcMAP 9.1 and need to get the areas of my polygons. How do I do that? Thanks for the help.Anonymoushttps://www.blogger.com/profile/08271671745973808745noreply@blogger.comtag:blogger.com,1999:blog-34248307.post-26468080528648281572007-09-18T13:40:00.000-04:002007-09-18T13:40:00.000-04:00Yes, ESRI added this functionality with 9.2 but us...Yes, ESRI added this functionality with 9.2 but use the tool wisely. AREA and DISTANCE should never be calculated on data sets whose native spatial reference system (coordinate system / projection) is inappropriate for those characteristics. That is, area calculations on data sets kept in lat/long (Geographic Coord System, in ESRI jargon) will always be incorrect, and with this new release, ESRI has added the safety measure of not allowing the calculation to me made. Either things will be grayed out, or you'll get a warning that reminds you that you're about to do something that would generate a wrong answer (and it won't let you run it).<BR/><BR/>Area should only be calculated on data sets based on an equal area projection. Simply reprojecting the data frame "on-the-fly" to an equal area one MAY be adequate for using this tool (I haven't tested it), but it is not adequate during use of any analysis within ArcToolbox (all processes are run for the data with its inherent projection, NOT what the data frame is set to).<BR/><BR/>Diana SintonDiana Stuart Sintonhttps://www.blogger.com/profile/15508277208617151378noreply@blogger.comtag:blogger.com,1999:blog-34248307.post-79780792801478725082007-09-18T09:38:00.000-04:002007-09-18T09:38:00.000-04:00What perfect timing! I had a student yesterday wh...What perfect timing! I had a student yesterday who ran into the problem using the new / improved 9.2 measure tool with data in a Geographic Coordinate System. As long as all the spatial data files in your Data Frame are correctly defined as to their native coordinate system(s), you can alter the coordinate system of the Data Frame to any projected coordinate system (albeit a reasonable one for the geographic area in question). Once you have set the coordinate system of the Data Frame so that the data files are projected "on-the-fly", the area measurement tool is good to go. Then you can quickly change your Data Frame coordinate system back if you wish.Unknownhttps://www.blogger.com/profile/06044514238845809038noreply@blogger.com