Measuring area in maps with QGIS

by gonzoearth on February 8, 2012 - 17:10

gulf-coast, balloon-mapping, kite-mapping,

There were 4 different Public Labs maps made in the same area of Barataria Bay last year. We want to measure maps for above water wetlands area and I am using QGIS http://www.qgis.org to load up our geotiff map files and trace them.

There are measurement tools in the desktop suite, but we are creating a new vector polygons that can be saved together in a geographic "shapefile" that contains the geometry, spatial information, and an associated attribute table that can be populated with more information for different further activities.

In this picture you can see an active polygon being created while in edit mode. Each polygon has unique identification and is saved in the same shapefile.

Writing more soon about this project and using QGIS to do all sorts of things.

PDF version

Comments

Submitted by eustatic on March 29, 2012 - 19:28.

I'm interested in this because i'm currently using Google Earth Pro to conduct a similar kind of project, mapping spoil banks of oil canals. I would like to publish the .kmz / .shp / geodatabase in an open source format.

I've also had offers from Universities from other places in the US, to do volunteer student GIS analysis for the Gulf Coast.

Geotiff is the preferred format for public labs, yes? Is QGIS very large?

scott

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