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projecting to Swiss national grid

Question asked by mikbet on May 31, 2013
Latest reply on Jun 5, 2013 by mikbet
Hello,

I need your advise regarding changing coordinate system for some files.
I had no problems projecting some shapefiles from WGS84 to CH1903.prj. I think it has to do with the fact these layers were already defined, so just changed coordinate system. Also in the process here (Feature - Project) geographic transformation option is available to define the transition from one coordinate system to the other (WGS_1984_To_CH_1903).

I need the same coordinate system for some files which have downloaded from the open source data website http://data.gbif.org, the latitude and longitude are defined in decimal degree format but there is no coordinate system/no projection (as I understand). So now I have to choose Define Projection here instead of Project, which I think is were trouble starts... So I define the same CH_1903.prj BUT the layers won`t match although they have the same projection. Am I right to think it has to do with the fact that decimal degrees will not be converted to meters and that`s why the layers won`t match?

Data Type: Shapefile Feature Class
Geometry Type: Point

Projected Coordinate System: CH1903_LV03
Projection: Hotine_Oblique_Mercator_Azimuth_Center
False_Easting: 600000,00000000
False_Northing: 200000,00000000
Scale_Factor: 1,00000000
Azimuth: 90,00000000
Longitude_Of_Center: 7,43958333
Latitude_Of_Center: 46,95240556
Linear Unit:  Meter

Geographic Coordinate System: GCS_CH1903
Datum:  D_CH1903
Prime Meridian:  Greenwich
Angular Unit:  Degree

and

Data Type: Shapefile Feature Class
Geometry Type: Polygon

Projected Coordinate System: CH1903_LV03
Projection: Hotine_Oblique_Mercator_Azimuth_Center
False_Easting: 600000,00000000
False_Northing: 200000,00000000
Scale_Factor: 1,00000000
Azimuth: 90,00000000
Longitude_Of_Center: 7,43958333
Latitude_Of_Center: 46,95240556
Linear Unit:  Meter

Geographic Coordinate System: GCS_CH1903
Datum:  D_CH1903
Prime Meridian:  Greenwich
Angular Unit:  Degree



I also tried to be clever and change the coordinate system by doubleclicking Layer Properties - Source - Set Data Source and choose the coordinate system from the previously projected layers but unfortunately those layers are the polygon layers and the ones I`m having problems with are observation points, but changing the coordinates in this way also geometry type would change (from point to polygon). 

What am I supposed to do please...

PS! Maybe I should also mention that the unprojected layers matched perfectly with each other (country shapefiles in WGS84 and the observation points with no coordinate system).

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