Exercise: Measuring point coordinates using WMS Google maps
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| − | Coordinates are often needed for ground control points (GCP) with the objective to georeference remote sensing data or scanned maps without graticule. Google maps can be used as one source for registering point coordinates.
| + | ==Open highly precise geodetic a German base map "Amtliche Karte"== |
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| − | == Import highly accurate DGPS points stored in a ASCII CSV file == | + | |
| − | # Click {{button|text=Add delimeted Text File }}. Select the input file ''GBdata\GBData\GNSS\Festpunkte_Forstbotanischer_Garten.csv''. Define the X field: ''East'' and Y field ''North''. {{button|text=OK}}.
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| − | # Specify the coordinate reference system (CRS) ETRS / UTM zone 32N. Search for the EPSG code: ''25832''. Three precise geodetic survey points are loaded into the viewer. The current active project CRS is displayed on the lower left frame of the viewer as EPSG:25832.
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| − | # Activate {{mitem|text=Web --> Openlayers plugin --> Google Maps --> Google Satellite}}.
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| − | A high spatial resolution aerial othophoto originally aqcuired in 2009 provided by GeoBasis-DE/BKG (Bundesamt für KArtographie und Geodäsie, Frankfurt is loaded in the viewer. Note, the active CRS is automatically changed to EPSG:3857 (WGS84 / Pseudo Mercator).
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| − | # Add additional open data sets of the BKG. Click {{button|text=Add WMS Layer}}. {{mitem|text=Layers --> New}}. Fill the connection details. Name: ''WMS BKG'', URL: ''http://sg.geodatenzentrum.de/wms_dtk250''. {{button|text=Connect}}. Select Layer ID = 01, Name = dtk250. The topographic map 1.250.000 of Germany is loaded. Zoom out to a larger view extent.
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| − | Click {{button|text=Add WFS Layer}} and Server connections {{button|text=New}}. Fill the connection details. Name: ''WFS DLM250 BKG'', URL: ''http://sg.geodatenzentrum.de/wms_dlm250''. {{button|text=Connect}}. Mark the row with TITLE = OBJART_43002_f01 (Forest). Check ''Only request features overlapping the current view extent. Add. , Name = dlm250. The topographic map 1.250.000 of Germany is loaded.
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| | [[category:Forestry Application]] | | [[category:Forestry Application]] |
Revision as of 16:19, 30 June 2016
Open highly precise geodetic a German base map "Amtliche Karte"
