Bestand:Map of states and counties affected by the Dust Bowl, sourced from US federal government dept. (NRCS SSRA-RAD).svg

Oorspronkelijk bestand ‎(SVG-bestand, nominaal 691 × 633 pixels, bestandsgrootte: 4,65 MB)

Dit is een bestand van Wikimedia Commons.
Onderstaande beschrijving komt van de beschrijving van het bestand daar.

Beschrijving

Beschrijving	English: Based only on that PNG image. I made this file primarily using QGIS, and the following public domain [ https://www.census.gov/geo/maps-data/data/tiger-cart-boundary.html shapefiles from census.gov]: cb_2015_us_state_20m cb_2015_us_county_5m The map projection is: NAD83(2011) / Texas Centric Albers Equal Area +proj=aea +lat_1=27.5 +lat_2=35 +lat_0=18 +lon_0=-100 +x_0=1500000 +y_0=6000000 +ellps=GRS80 +units=m +no_defs The original PNG, rotated and scaled slightly to fit this version of the Albers EA projection, is in the image for your comparison. The approximated areas of the Dust Bowl were traced from the PNG in InkScape, no shapefile was made or used. This is definitely the current crown jewel of my Wikipedia images. It took the longest to research and make and it took lots of software. But it was definitely worth it - this map has been requested by readers of w:en:Dust Bowl three times. Someone had to deliver eventually.
Datum	15 januari 2012
Bron	Based on map by ID m12545a/55 by Natural Resources Conservation Service, Soil Science and Resource Assessment, Resource Assessment Division (NRCS SSRA- RAD) Baitsville, MD Jan 2012 The source of that map: Map 2579, March 1954, U.S. Dept. Of Agriculture Soil Conservation Service https://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/about/history/?cid=stelprdb1049437
Auteur	Soil Science and Resource Assessment, Resource Assessment Division (NRCS SSRA-RAD) (Division of the U.S. Dept. Of Agriculture)
SVG ontwikkeling InfoField	De broncode van dit groot SVG-bestand is niet deugdelijk vanwege een fout. Deze zeer grote niet W3C-deugdelijke kaart is gemaakt met Inkscape. en met QGIS.

Licentie

This image or file is a work of a United States Census Bureau employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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Bestandsgeschiedenis

Klik op een datum/tijd om het bestand te zien zoals het destijds was.

	Datum/tijd	Afmetingen	Gebruiker	Opmerking
huidige versie	26 jan 2017 13:47	691 × 633 (4,65 MB)	Psiĥedelisto	Attempt to fix the font by using the recommended font definition on Help:SVG
	22 jan 2017 05:49	691 × 633 (4,65 MB)	Psiĥedelisto	recolor miscolored county
	15 jan 2017 14:41	691 × 633 (4,65 MB)	Psiĥedelisto	User created page with UploadWizard