31 January, 2010

Week 3: GIS cartography via maps of Mexico






Creating this first map taught me how to create a new shapefile from a selected part of another shapefile, a technique I look forward to using in the future.




I thought I was doing well with the map until I looked at it on the blog and realized how cluttered the labeling was and how poorly the word Mexico shows up on the country. However doing the second map in this lab, below, taught me a bit more about that. I did have a lot of frustration trying to get the labelling right as initially I couldn't get the map to display only urban areas with populations over 1 million - despite checking all the right boxes, I think - and only when I switched to data from layout view was I able to get it correctly labeled.




For the third map we looked at a raster file of elevation for Mexico - I had to check an atlas before concluding that the figures must be in meters - I couldn't find this anywhere in the metadata. I would think that stretched symbology (which is shown here) would be a better way to depict elevation because elevation changes continuously rather than jumping from category to category, but I actually found the classified symbology map - not shown here - easier to comprehend. I did wonder why the raster file had some small missions, or empty spots, where Mexico had no elevation information; this is probably not visible on this map.

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