What could you use to indicate historical earth conditions?

Transcription

1 What could you use to indicate historical earth conditions? Deeds, Plats, Surveys Aerials Topography Soils Rainfall

2 Google Earth as aerial previewer Georeference with spatial bookmarks What a GeoPdf is

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4 What can you get? or USDA s NAIP Who do you know? NRCS US Geologic Service (USGS) Digital Raster Graphics

5 Aerials SDE, spatially enabled our Gwinnett County archive goes back to 2000 Static tiffs or jpegs that need to be georeferenced. point indexed 1989, 1972, 1955 and some 1940 hardcopys Google Earth history tab Georgia GIS Clearinghouse ARC list center/gis data maps/gis data

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9 Quad based imagery download function of the Clearinghouse is no longer available. The imagery is still accessible via Imagery web services at: you just won t be storing the data locally. If you re connecting through ArcCatalog, you can access the services at: Here is a how-to document that will step you through the connection process: If you re running an ArcGIS version prior to 9.3, you ll have to use the WMS option there s a compatibility issue between Image Server 9.3 and pre-9.3 clients. From the Clearinghouse Data Search page, click the Services link and then select Imagery: Click an imagery service, CIR1999IS for example, and at the bottom, next to Supported Interfaces, click WMS. Once you ve done this, copy everything in the URL prior to the question mark. For example, for the CIR1999IS service the URL is: Then, in ArcCatalog under GIS Servers, click Add WMS Server and paste the URL in the box. Click OK and the service will be added. Also, county extent imagery from the USDA s NAIP flight is available for direct download from the Clearinghouse Data Search page at Just run a search where Layer = Imagery and Originator = U.S. Department of Agriculture.

10 Data Type: ArcGIS Image Service Service Name: Imagery/DOQQ1993IS URL:

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12 \\jacgisfs01\gisdata01\aerial_photography\historical_photography\1955_aerialphotography_tiff\atk 6P 125.jpg

13 Sourcing Spatial Data GAFM Conference, Atlanta, GA

14 Stone Mountain Hwy & Bethany Church Rd Stone Mtn Hwy & Stone Drive Brannan Rd & Leach Rd Rockbridge Rd & Stone Drive Annistown & Ross Rd Ours Came from raw contacts from Clearinghouse

15 Add Historic Topography Try Data Type: ArcGIS Image Service Service Name: Imagery/DRG24IS URL:

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18 Topography Gwinnett County s goes back to 1989, spatially enabled Earlier than that, try USGS GeoPdfs

19 Sourcing Spatial Data GAFM Conference, Atlanta, GA

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37 Subject: RE: file attached, 1956 Topo w/modern Roads Karen, Do you have any sense on what the error +/ X feet on this? Thanks

38 Subject: National Map Accuracy Standards RE: file attached, 1956 Topo w/modern Roads This United States Department of the Interior Geological Survey map is imprinted This map complies with National Map Accuracy Standards. for horizontal accuracy, not more than 10 percent of the points tested are in error by more than 1/30 inch at scale 1:24000 for vertical accuracy, not more than 10% of the elevations tested are in error more than ½ the contour interval. The printed contour interval is 20 feet, so not more than 10% of the elevations tested are in error more than 10 ft.

39 67 ft. Technical jargon follows: The scale of the original USGS topo map is 1: This means that when the USGS topo map is printed at the original size, one printed inch represents 2000 feet of ground surface distance. (Because 24000/12 inches = 2000). for horizontal accuracy, not more than 10 percent of the points tested are in error by more than 1/30 inch at scale 1:24000 The math: 24000/12 = /30 inch on paper printed at 1:24000 represents ft ground surface. Because 2000/30 = I originally provided a georeferenced map where the scale was set at 1:5280, so that paper map printed gives one inch represents 440 ft ground surface distance. The question is now, how much of that printed paper represents feet? About 1/6 inch.

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43 Go to XY

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45 Type in Press FLASH*

46 Did you notice this is not the bookmark yet?

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50 Right click, Zoom to layer

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61 NRCS Soil Surveys Detailed Soils Map. It should bring up a map of the County with a panel index.

62 Archived soil survey for Gwinnett Open Panel 49

63 According to the legend on the soil survey, the long dash, triple short dash line is an intermittent stream.

64 According to the legend on the soil survey, the long dash, triple short dash line is an intermittent stream.

65 Spatially enabled soil survey for Gwinnett No metadata

66 DWR Stormwater is Updating NRCS & Category 1 Dams Rainfall Data

67 Google Earth as aerial previewer, use it to get lat/long Georeferencing with spatial bookmarks What a GeoPdf is Stormwater Division karen.lougee@gwinnettcounty.com GIS Associate III of Stormwater steve.hart@gwinnettcounty.com Planning Manager of Stormwater GIS steve.leo@gwinnettcounty.com Director of Stormwater Division