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.
0
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2answers
80 views
Why the layer can be loaded to Google Map not OpenStreet Map using MapServer?
Updates: Problem Solved !!!!!!!!!!!!!!!!!!!!!
Replace "wms_srs" "EPSG:3857" to "wms_srs" "EPSG:900913" in Mapfile
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I am using ...
2
votes
1answer
35 views
Does the Load Data function in ArcCatalog automatically re-project the data?
If I have a feature class within a dataset in one coordinate system and using the Load Data function, load that data into a feature class of a different dataset that's in a different coordinate system ...
7
votes
2answers
89 views
Problem with plotting map in R
While plotting the gadm map of Russia in R, I have a problem at the 180 degree meridian, where part of the Russian region is plotted separately. You can see it on the plot using the following code ...
3
votes
0answers
28 views
Using PROJ.4 library to transform from local coordinate system coordinates to global coordinate system using ground control points?
I have a point cloud whose coordinates are with respect to a local coordinate system. I also have ground control points with GPS values. Can I convert these local coordinates to a global coordinate ...
0
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2answers
36 views
CORINE land cover 2000: coordinate reference system
The PDF in this link states that the CORINE land cover 2000 used ETSR89 as its coordinate reference system: http://www.eea.europa.eu/publications/technical_report_2006_7
I wanted to check I am ...
12
votes
1answer
186 views
Creating nanoscale DEM with GDAL
A bit of a strange question perhaps, but let me give you a breif explanation of the background before my actual questions:
Atomic force microscopy (AFM) is a method that, in short (and to my limited ...
1
vote
1answer
34 views
Linear unit of a Coordinate system
My dataframe coordinate system is in UTM with linear unit Meter.
If I have a Polygon shapefile in a UTM coordinate system with a linear unit of Foot_US and I am sent a shapefile in the same UTM ...
1
vote
1answer
30 views
Add MicroStation dgn to ArcGIS/ArcCatalog 10.1
I'm an iOS programmer but new to using ArcGIS 10.1. I'm having a problem loading my MicroStation dgn file to ArcCatalog. I've connected the folder containing my MicroStation V8i roadway design dgn to ...
1
vote
1answer
53 views
Python GDAL/OGR: WGS84 & meters units
I'm dealing with shapefiles projected in:
GEOGCS["GCS_WGS_1984",
DATUM["WGS_1984",
SPHEROID["WGS_84",6378137,298.257223563]],
PRIMEM["Greenwich",0],
...
0
votes
2answers
36 views
How do you convert to DMS from 9-digit LAT/LON code? [duplicate]
I'm trying to map the national bridge inventory, but the coordinates are stored in this 9-digit code for LAT and LON
EXAMPLE:
Longitude is 81°5.8'
Code is 081054800
Page 9 of document found here ...
2
votes
0answers
32 views
Measurements across UTM zones, better to use geographic or planar approaches?
I have a survey grid spread across 3 UTM zones (36N, 36S, 37S). I want to find the nearest distances of the centroids of these grids to roads.
At what scale should I start to consider using geographic ...
1
vote
1answer
120 views
Mapping latlng values to a point on a HRAP grid
I have a copy of some NWS rainfall data loaded into a PostGIS database. Given a lat lng point, I want to find the rainfall for that given day.
The original data are in XMRG format and projected ...
1
vote
1answer
24 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
17 views
How to convert Rotated Polar grid raster to Non Rotated Polar Raster? [duplicate]
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
1
vote
1answer
55 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
36 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
36 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
60 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
vote
1answer
42 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 ...
0
votes
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
57 views
Thiessen Polygons and Coordinate Projections [closed]
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
74 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
42 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
50 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
67 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
29 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
52 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
85 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
58 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
123 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
26 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
84 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
50 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
23 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
49 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
49 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
73 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
100 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
107 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
170 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
44 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
133 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
61 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
116 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
38 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
77 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
56 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
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 ...
