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.
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1answer
18 views
Editor and projections ArcGIS
When opening an edit session Arc is telling me that some of my shape files' coordinate systems do not match the data frame.
Here is the data frame coordinate system:
Stereo_70
Projection: ...
0
votes
0answers
14 views
How to convert Rotated Polar grid raster to Non Rotated Polar Raster?
I have a RCM data which is in rotated Polar system , I want it to convert into non-rotated polar RCM. How can i do this things ? Please give some guidance
0
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0answers
43 views
Convert DHDN Bessel 1841 to latitude/longitude
I have a list of map coordinates, (x,y) e.g.
(526474.00000, 818507.00000)
(528517.00000, 817887.00000)
How can I convert these to latitudes and longitudes?
I tried looking at them with this ...
1
vote
1answer
48 views
Geometry has incorrect latitude-longitudes
SELECT ST_SRID(geom) AS s FROM zones GROUP BY s;
returns a single record: 4326
SELECT Find_SRID('public', 'zones', 'geom');
returns 4326
SELECT AsText(geom) FROM zones
returns geometry like:
...
0
votes
1answer
28 views
Geoprocessing tool not executing when Map's SpatalReference is Web Mercartor
I am facing a strange issue when trying to execute GP service when my map's spatial-reference is Web Mercator. I appreciate all help.
I have a JavaScript API application. Initially I only had my map ...
1
vote
1answer
26 views
If I've given two different layers the same CRS, why won't they overlay one another?
I have a "towns" and "state" shapefile for Massachusetts as two separate vector layers in QGIS. I've set the project coordinate system to WGS 84 at the bottom of the screen (next to the "coordinate" ...
1
vote
1answer
53 views
Some terms related to coordinate
I was googling coordinate related information all the day. Now I am confused with some concepts and terms. I hope some one can help me to make it clear.
Geographic coordinate system
Geographic ...
1
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1answer
36 views
When is a projected length calculated via a pythagorean distance more accurate than an ellipsoidal length?
I'm using spatialite 3.0.1 with the following test data (in EPSG: 4326):
Name astext(geometry)
---------- --------------------
Belitsa POINT(23.563 41.947)
Malko Tarn POINT(27.533 ...
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0answers
32 views
what is the difference between the Geographic coordinate, transformed coordinate and screen coordinate [duplicate]
What is the difference between the Geographic coordinate, transformed coordinate(projected) ,cartesian coordinate, and screen coordinate? Is there a live example?
And what is the association between ...
0
votes
2answers
44 views
Thiessen Polygons and Coordinate Projections
I am trying to perform a Thiessen Polygons analysis in ArcGIS 10.
My DEM is in GGRS_1987 and the point set I downloaded from Google Earth is in WGS_1984. The points display correctly but when I run ...
2
votes
1answer
56 views
GDAL/Python: How do I get coordinate system name from SpatialReference?
In Python, using GDAL, I've extracted a raster's projection as a WKT string as follows:
wkt = dataset.GetProjection()
# wkt is ...
0
votes
1answer
30 views
How can I find the SRID from the WKT out of a GRIB file?
I have a grib2 file which I'm trying to import into PostGIS 2.0 Raster and process. Trouble is, I can't figure out what the SRID is supposed to be, or one close enough for government work. Running ...
0
votes
1answer
46 views
Is it possible to change dynamically the map spatial reference?
I have a map that uses ArcGIS Online in the small scales. So my map needs to be in Web Mercator in small scales.
In the big scales, my web client Flex application uses some feature and map services to ...
1
vote
1answer
55 views
Why do points shift when reprojected from WGS84 to a state plane coordinate?
We have a Trimble unit we use to collect equipment.
We collect the data in WGS84 and differentially correct it and then reproject it to a state plan coordinate system.
The points always shift the ...
2
votes
1answer
62 views
Calculating points in the USDA's Cropland Data Layer coordinate system
I need to integrate against the USDA's cropland data layer. They've got a demo and some API docs.
The important query I need to run is this, given an (x, y) of say (1551459.363, 1909201.537):
...
0
votes
0answers
23 views
Switching between different feature sets / Change orientation of Openlayers Map
Setup
Entities postgis table:
id | name | the_geom | campus_id
1 | bldg_1 | <b1_geom> | 1
2 | bldg_2 | <b2_geom> | 2
3 | bldg_3 | <b3_geom> | 1
4 | bldg_4 | ...
3
votes
1answer
49 views
Best way to create a georeference and projected data from a hand-drawn maps of mythical village for use in spatial stats training modules
I am preparing datasets for students in a spatial statistics course for a module on spatial autoregressive models. We will use ArcGIS 10.1. The first dataset will correspond to a mythical ...
1
vote
1answer
53 views
PROJ4 C++ API: Amersfoort RD New to WGS84
I try to convert between dutch RD New (EPSG:28992) and WGS84 (EPSG:4326) via PROJ4 C++ API.
On the console this works with:
cs2cs +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 ...
2
votes
1answer
51 views
Why does a raster in Gauß-Krüger has a little offset to a shape in UTM?
I have raster data (TIFF files) where I think it's spatial reference is in Gauß-Krüger ("DHDN_3_Degree_Gauss_Zone_3") and some shape files in UTM ("ETRS_1989_UTM_Zone_32N_8stellen"). As you can see in ...
3
votes
1answer
96 views
What to set spatial reference to after projecting to GCS_WGS_1984
I have a shapefile containing some sort of vectors or polygonal chains. This file is in the GCS_CH1903 geographic coordinate system (it is not specified though... if I import it into ArcMap it says ...
1
vote
0answers
23 views
How to identify grid shift file used by osgeo in Python?
I wrote a Python script reprojecting points from a source coordinate reference system (SCRS) to a target one (TCRS) both identified by an EPSG code.
I would like my python script to retrieve details ...
4
votes
2answers
77 views
How can I find an appropriate coordinate reference system?
I have a worldmap and need to present different countries (e.g. Japan and France) in different extracts in QGIS. Thus I need to find out the best way to decide for an appropriate CRS for the ...
1
vote
1answer
47 views
problem of buffering a point on large areas with a projected coordinate system
could someone clear this up for me please. i remember reading an article not long ago on the web about the problems associated with buffering points on a globe due to the fact that a globe uses angles ...
0
votes
0answers
18 views
Program to read Microstation CRS definition file (.dty)?
Are the other programs/tools (beside MicroStation) that can read MicroStation coordinate system definitions stored in .dty files? It seems to be a binary only storage format and I can't decipher it ...
2
votes
1answer
44 views
Ok to measure and union a projected-on-the-fly shapefile in ArcMap?
I have a dataframe in arcMap 10.0.4 that is of Africa Albers Equal Area Conic PCS. I bring in a census shapefile of WGS 1984 CS and it is projected on the fly.
I do 2 things:
I use the calculate ...
2
votes
1answer
47 views
why can I only define 6 custom CRS?
Using Q GIS 1.8.0 - I am trying to create several custom CRS definitions for the purpose of rectifying several split areas of a census shapefile.
In the "Custom Coordinate Reference System Definition" ...
1
vote
1answer
68 views
Data points Imported into QGIS are in the middle of ocean
I'm new to QGIS and tried importing some GTFS data in the CSV format (stops.txt). The project CRS, base map CRS and GTFS CRS have all been set to Google Mercator, but the points that are supposed to ...
0
votes
1answer
79 views
Openlayers Linestring over edge of map
im trying to create a route displayer for ships. But im struggling with the edges of the map. When going from ie. 179* to 2* it displays a line across the entire map, instead of displaying it on the ...
5
votes
1answer
98 views
Export spatial overlay from R package PBSmapping
After realising that the GEOS-library in Grass and the R package rgeos is incredibly slow, i found the packe "PBSmapping" to do the same thing, a Union of two Polygons and to cut the parts with no ...
0
votes
0answers
12 views
Units of Geometry & Geography data type [duplicate]
When you store data using the Geography data type (like in PostGIS), is it always in lon/lat in degree decimals?
For the Geometry data type, what are the units used in the coordinate pairs? Can it ...
1
vote
2answers
160 views
What Spatial Reference System do I store Google Map's Lat/Lng in
I am new to PostGIS, Spatial Reference Systems and projections and want to store lat/lng coordinates retrieved from Google Maps and Openstreetmap and its services like the Geocoder/Nominatim. I'm ...
1
vote
1answer
36 views
Modify CRS to match boundaries of shapefile
I have boundary data in WGS 84 and data in a custom generated CRS. The data in the generated CRS appears to be offset by a particular vector. I want to attempt to match the generated CRS projection ...
2
votes
1answer
109 views
QPJ files on ESRI software
We have some GIS data, which was converted from AutoCAD dwg to TAB using mapinfo, then converted to shapefiles as that's what we are required to create. Editing the data fields was done in the shape ...
2
votes
1answer
56 views
How to fix distortions for Baden-Württemberg?
I'm working in an area in Baden-Württemberg, Germany. I loaded some OSM data in QGIS but the map display is distorted.
I tried ftools define projection with many different projections but nothing ...
1
vote
3answers
101 views
How to create a spatial reference file
I am using python, arctoolbox and arcpy 10.0
I am running a script that is tied to an arctoolbox. The toolbox serves to enter in my parameters. I have a feature layer as an input. The feature layer ...
0
votes
0answers
37 views
Default CRS in QGIS isn't applied to new layers
I've set my CRS settings in QGIS to to use OSGB (EPSG:27700) wherever possible.
However when I create a new shapefile layer this setting is not applied and I have to manually select the CRS.
...
0
votes
1answer
59 views
CRS is UTM 51, the coordinates are shown in meters, show same coordinates as lat long as well?
We are working with a CRS of UTM 51N, the Philippines. The coordinates under cursor are shown as metric values. Clients however like so see the Latitude Longitude values when they move the cursor.
Is ...
2
votes
1answer
53 views
How to bulk import ESRI projections into Postgis
Where can I get a file that would allow me to bulk upload all of the ESRI projections into the spatial_ref_sys table of postgis. I know that you can get insert statements on spatialreference.org; ...
6
votes
1answer
75 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
626 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
97 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
27 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
60 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
53 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
160 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
146 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
69 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
231 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
49 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.
