A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.
6
votes
1answer
82 views
Should I Reproject Data Which Has Been Captured Incorrectly?
I'm working on a project for a client which is migrating data from an Oracle database to an ESRI Geodatabase. When data for this project was initially captured over 15 years ago, the coordinate ...
1
vote
1answer
680 views
Convert latitude longitude coordinate to x y coordinate?
I'm using a postgis database and java to develop my application.
I need to transform my geographic data currently in latitude/longitude format into a x/y format.
I found solutions based on UTM ...
1
vote
1answer
114 views
Change coordinate system in multiple MXDs ArcGIS 9.3 using Python
I have to loop through some folders which may contain *.mxd files and change their coordinate system. I already found this piece of Python which should do the trick for ArcGIS 10.x (from here):
...
1
vote
1answer
32 views
Setting coordinate systems in gvSIG: workflow or transformation issues
I am learning how to use gvSIG 1.10 (Mac OS 10.6.8 Snow Leopard). My goal is to create a simple county map of Illinois using the base data shapefiles available from the Illinois Natural Resources ...
2
votes
1answer
69 views
Setting coordinate systems in QGIS: “transform error caught”
I'm learning how to use QGIS (v 1.8.0 "Lisboa") on Mac OS 10.6.8. My goal is to create a simple county map of Illinois using the base data shapefiles available from the Illinois Natural Resources ...
1
vote
1answer
56 views
Why would a map lost the coordinate system when I use it in ArcGis?
I have a file in AutoCad with ETRS89 coordinates, and when I use the same map in ArcGIS it loses coordinates. With other files do not happen.
5
votes
1answer
194 views
Does anyone know the proj4 Coordinte Reference System command line for Rectangular Polyconic Gores?
I am a GIS beginner using QGIS 1.8.0
I am trying to transform a world map from the standard WGS84 Coordinate Projection System to a set of rectangular polyconic gores, with a gore count of 12.
...
2
votes
1answer
61 views
QGIS mixing up CRS
I´ve just started working with QuantumGIS for my thesis. I ordered shapefiles with the CRS: ETRS 89 UTM Zone 33N, but QGis layer properties now shows the layer has a different CRS (namely SWERE99 TM) ...
4
votes
2answers
159 views
Setting coordinate systems in gvSIG: Is the workflow similar to QGIS?
I am still learning how to use coordinate systems and projections, but I hope this basic question will be easy to answer. My goal is to be able to use either QGIS or gvSIG to create a simple county ...
2
votes
1answer
85 views
geocoding addresses specifically into NAD1983 or converting X,Y into 1983 after geocoding
I'm going bananas trying to geocode addresses into a NAD1983.
I have ArcMap 10.1 and I'm using the default address locator (North American 10.0 from arcgis online). No matter how low I set the ...
6
votes
2answers
269 views
Why do my Shapefiles not align correctly?
First: I'll summarize what I understand so far so please confirm or correct me.
When On-the-Fly is selected a layer is re-projected from
that of the layer's CRS to that of the project CRS, IF
...
4
votes
1answer
54 views
Unknown Old Coordinate System of the Phillipines
I am reading a report made in 1979 and the coordinates show N 46,400 and E 47, 600. This is in the Philippines. Would anybody know what the coordinate system was used in this numbers? Thanks.
3
votes
2answers
154 views
Is there any online tool for converting coordinates between different EPSG?
Every time I want to do conversion, I need to get into the console to run proj.4. Is there any online tools for converting coordinates between different EPSG?
3
votes
1answer
96 views
What are the highest and lowest precision Coordinate Reference Systems for US East Coast?
And does it matter what system your data layer begins with if you choose the right system for your project? Do some applications use more precise projection systems than others?
0
votes
1answer
93 views
Geostationary satellite projection to be introduced in GDAL
I'm working on raster files and their spatial reference system is:
PROJCS["Geostationary_Satellite",
GEOGCS["GCS_Unknown datum based upon the custom ellipsoid",
DATUM["D_Not specified ...
0
votes
1answer
83 views
CRS Conversion problem
My question is quite simple, this is probably why I couldn't find a conclusive answer anywhere.
I have two datasets representing the same area in Romania, but in different CRS, A is local, B is WGS ...
2
votes
1answer
360 views
Which coordinate system and projection shall I use for georeferencing google map image in ArcGIS?
I have saved Google Maps image (not Google Earth) of area at latlon(17.692437,83.218689) by some method in jpeg format. It is an exact snapshot of the Google Maps. Now I need to geo-reference it to ...
1
vote
1answer
67 views
Why are the areas covered by 2 Universal Polar Stereographic (UPS) coordinate different?
According to http://en.wikipedia.org/wiki/Universal_Polar_Stereographic_coordinate_system. the area covering Arctic is less than Antarctic. Any reasons for it?
It is due to the shape of the lands?
1
vote
1answer
189 views
Is it possible to convert data from WGS84 to Bessel1841?
When we convert data from bessel1841 to WGS84, parameter setting must be used because it is impossible automatic convert on QGIS.
Reference: Converting shp file from bessel1841 to WGS84
Is it ...
0
votes
1answer
45 views
Is it possible to download GPX another coordinate system except WGS(GCS) with GPS Tool on QGIS1.8.0?
I got GPS data with using bessel1841 as coordinate system.
When I download GPX data on GPS tool, it is automatically treated as WGS84.
Can I use another coordinate system when I download GPX on GPS ...
0
votes
0answers
61 views
What kind of unit of measurement for scale does SQL Server 2012 Spatial use?
What kind of unit of measurement for scale does SQL Server 2012 Spatial use?
2
votes
1answer
53 views
How to get a list of all projections that are currently available in QGIS via the PyQGIS-API
i'm building a QGIS-Plugin and i want the user to choose a CRS out of a combobox in which the coordinates he would enter into some textfields are represented, so these can be converted into another ...
0
votes
1answer
96 views
Why are layers not overlapping to each other inspite of having same CRS? [closed]
I am new to QGIS and working with QGIS 1.7.3 version, I have my all layers in WGS 84 CRS but even though they are not overlapping to each other, What should I do ?
3
votes
1answer
183 views
getting the specified geographic transformation, or at least the GCS, of a data frame
First, the TLDR digest:
I'm getting a bogus value from dataFrame.geographicTransformations on some machines; how do I get the correct value as shown in the properties dialog? and/or
Given a spatial ...
0
votes
0answers
138 views
How to represent clustering of geographical points on map in STATA?
I've plotted a map on STATA using user-written program spmap and have also obtained the grid for my space using spgrid program. Now I want to see where most of my data points are clustered on map. Is ...
2
votes
1answer
108 views
Problems with NAD27 projection in QGIS
I have some data that is in NAD27, but I am having a hard time displaying it in QGIS. I think that the problem is with the CRS. I cannot seem to find the correct NAD27 option. The closest one seems ...
4
votes
1answer
90 views
Problem with custom projection definition in Qgis
I want to define a custom crs valid for Mexico. The context is that older cartography in Mexico is based on the NAD27 datum. I wanted to test the following proj4 string
+proj=longlat +ellps=clrk66 ...
2
votes
3answers
206 views
How to handle layers with different Spatial references in ArcGIS Runtime SDK WPF?
I am currently writing the "Zoom to Layer" function for my application. However, the spatial references between my imported layer and my base map is different?
Is there a way around this? Can I some ...
3
votes
1answer
556 views
Convert GPS coordinate to ArcGIS x,y point?
I'm trying to plot some AGSSimpleMarkerSymbol's in a AGSGraphicsLayer. The issue I'm running into is that the data I'm starting with are GPS coordinates (lat/lon). I'm using AGSPoint to plot the data, ...
1
vote
1answer
184 views
matching georeferenced jpg with GPS data in WGS84 [closed]
I have imported my georeferenced jpg which I believe (on the basis of metadata in xmml file) to be in the NZGD2000 TM coordinate system.
metadata:
Origin:
1.76759e+06,5.94938e+06
Pixel Size:
...
2
votes
1answer
57 views
Need to convert from ISpatialReference to SpatialReference
I am attempting to write a method in C# that will accept as input, an ESRI.ArcGIS.Geometry.ISpatialReference object and convert it to an ESRI.ArcGIS.Client.Geometry.SpatialReference object. I need ...
3
votes
1answer
556 views
What is the relationship between ITRF and WGS84?
Why are there people saying that "I am using WGS84(ITRF96)"?
There are newer version of ITRF. Will WGS84 follow it?
If so, what will be the influence to us?
5
votes
2answers
549 views
Location of Coordinate Systems folder in ArcGIS 10.1
To make it easier to find and select the 3 or 4 coordinate systems we use most often in ArcGIS 9.x and 10.0 we would copy them to the top of the Coordinate Systems folder, generally located in ...
2
votes
0answers
40 views
Spatial indexing of a point pattern in R [duplicate]
I have a point pattern and a tessellation (grid) in R. Is there a way to spatially index each of my points? In other words, my tessellation grid has n quadrats, I would like to know for each of my ...
0
votes
0answers
57 views
What's the difference between CRS 4326 , CRS 4978 and CRS 4979?
They are all based on WGS84. 4326 is called "geographic 2D", 4978 is called "geocentric", 4979 is called "geographic 3D".
What are the differences between these three?
Why are we using "geographic ...
4
votes
1answer
187 views
Can I say WGS84 is more accurate than NAD83 in terms of their reference ellipsoids?
Other than its application, can we say the reason of common adoption of WGS84 is due to its accuracy?
6
votes
1answer
156 views
Coordinate system in aerial imagery
I am calculating WGS84 coordinates of points in an aerial image, given the WGS84 coordinates of the center of the image and the ground distance width and height (calculated from altitude and lens ...
8
votes
1answer
271 views
How can I see the coordinate transformation parameters in QGIS?
How can I see (and edit if possible) the transformation method and parameters used by QGIS for "on-the-fly" transformation, and then for saving data in another CRS? Like in ArcGIS?
Here is the ...
5
votes
1answer
108 views
How do I make the scalebar accurate when I am working with a google satellite image in QGIS?
I start a project in QGIS. I set the CRS to anything (in this case I use EPSG=26918 a NAD83 datum). I also enable on the fly projection. Then I import a vector. In this case a kml, which I believe is ...
2
votes
1answer
339 views
Converting geographic coordinate system in R
I have points in geographic coordinate system and I wanted to convert them to swiss grid (CH1903+).
Sample data:
id lon lat
2 7.173500 45.86880
3 7.172540 45.86887
4 7.171636 ...
5
votes
1answer
173 views
How to Display the World Map in Projected Coordinate Systems
I am trying to create a simple presentation map and I download the global level country boundaries shapefile from http://www.diva-gis.org/Data. The layer coordinate system is in Geographic Coordinate ...
5
votes
1answer
88 views
Where is the Spatial reference ID stored in SpatiaLite?
I have loaded a shapefile into a SpatiaLite Database using the spatialite-gui. In which table is the Spatial reference ID or EPSG code (of the stored data)stored in SpatiaLite?
1
vote
1answer
190 views
QGIS 1.8.0 - Define shapefile as UTM 15 NAD83 Feet
I have a shapefile which the .prj file says it is
...
7
votes
2answers
564 views
Nearest point on a line ( Spherical / Mercator projection )
I have a line (Ax,Ay - Bx,By) over a mercator projection (google maps) and a random point (Cx,Cy) nearest to that line, i would to know the closest point (transparent blue on the image) over that line ...
3
votes
2answers
2k views
Convert X,Y State Plane coordinates to decimal degrees
I have 1000's of data point I need to convert from North Central Texas 4202 into Lat/Long decimal degrees. Can someone give me a conversion equation so I can quickly convert using excel? I have only ...
2
votes
1answer
244 views
Reprojection from WGS to Slovenian Gauss Kruger in QGIS
I have gpx file (track) in WGS84 (EPSG: 4326) coordinate system from Garmin GPSMAP 62 which is right projected in BaseCamp and MapSource. When I save track as *.GPX and import it to QGIS and use ...
1
vote
1answer
405 views
SRID 4326 and geometry conversion
From this line:
SELECT ST_AsEWKT(geom) FROM buildings LIMIT 1;
I get this result:
"SRID=4326;MULTIPOLYGON(((404269.308014269 4543087.6184561,...)))"
I'm wondering if the coordinations are ...
2
votes
1answer
97 views
What are the geometric principles and GIS techniques that I can use to generate a postcode coverage of my city at street scales?
Postal codes of Brazil and another countries are oriented to distribution logistics, and improvement of reliability in writing the postal addresses; but without much concern for the spatial ...
0
votes
1answer
75 views
Why does Find_SRID return zero?
using
SELECT Find_SRID('public', 'myTable', 'myColumn');
I get zero as the result, what does it mean?
Regards,
2
votes
2answers
272 views
What can go wrong in UTM to WGS1984 conversion (shifted data)
I try to convert .shp files to OSM data with shp2osm and ogr2osm but the output data is shifted.
Semi-Cross-Posting Warning: I have already asked a questions on the OSM help site, but this questions ...
