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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2
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1answer
749 views

ArcGIS giving measured distances and the scalebar incorrectly

I am currently using ArcGIS 10.1 and am struggling to be able to measure distance or set a scale bar correctly. Its currently giving me absurd results orders of magnitudes to small (0.5m etc). All my ...
2
votes
0answers
277 views

Which of EGM96 geoid or WGS84 ellipsoid fits the earth better?

ImageCredit Question If we separately add up |H| and |h| over the earth surface, which of the sums come out smaller? Background There is a phrase in the tag description of "ellipsoid" that says ...
2
votes
1answer
109 views

What do different realizations of the same datum have in common?

Firstly, am I correct in assuming that the process of determining the shape and the size of the spheroid is independent from the process of determining the origin and the orientation? For example, ...
4
votes
2answers
91 views

towgs Definition for European Datum 1950

I am new to all things GIS so apologies for a basic questions. I am trying to specify the CRS of a climatic raster layer in R. It is an equal area projection based on Europe Equidistant Conic and the ...
1
vote
2answers
858 views

How to display WGS 1984 Web Mercator (Auxiliary Sphere) services in Google Earth?

The basemap services provided by Esri (on ArcGIS Online, Data and Maps for Sever, and the Data Appliance for ArcGIS) use the WGS 1984 Web Mercator (Auxiliary Sphere) spatial reference (WKIDs 102100 or ...
1
vote
2answers
444 views

Predefined Coordinate Systems missing in QGIS 2

in QGis 1.8 were lots of predefined coordinate systems (national projections). Where have they all gone in qgis 2.0? I specifically need the Gauß-Krüger-Projections Zone 1 to 5. Is there any plugin ...
0
votes
1answer
101 views

How to create shapefiles with z coordinate with QGIS

I'm working with QGIS, and I want to create a shapefile with the elevation coordinate, I can't find something similar to what I was used to do in Arcgis, can you help me? Thanks for your help Luís
1
vote
1answer
36 views

Description CRS EPSG:6372

does someone know where could I find a description of CRS EPSG:6372. I searched in the EPSG page but seem not to find something that quick.. Any help would be really appreciated. Regards!
1
vote
2answers
67 views

Why does my gpx layer go to the wrong spot even if they have the same CRS?

Help! I am a QGIS beginner with a big problem! I am trying to load a gpx file from Garmin into my map. The project CRS is WGS 84, and the incoming data is in CRS WGS 84. When I look at the bottom of ...
1
vote
1answer
298 views

Get a spatial reference object by name from a saved string

I am creating an ArcMap 10.2 extension is VS 2012 and C#. I want to give the user the option to select a spatial reference to be applied to a layer - planning to use the Dialog for that. But then, ...
1
vote
1answer
157 views

Problem changing CRS to enable clip function

I have two layers, one point file and one polygon. The point file is in WGS 84 and polygon in NAD83-UTM10. The project CRS is NAD83-UTM10. They project fine with on-the-fly projection turned on. I ...
1
vote
1answer
79 views

My Coordinate Reference System listing is in the wrong language

I just installed QGIS Desktop 2.0.1 on a desktop (Windows 8-64). All the menus are in English-US (as they should be), but the CRS listings -- when I try to change them for a project are a layer -- ...
3
votes
4answers
273 views

what is the suitable projection coordinate system for Iran

I am doing analysis for province wise Iran. I am using WGS1984 as my geographical coordinate system, and I do not know which is suitable Projection coordinate system for entire Iran. I feel the UTM ...
1
vote
2answers
176 views

Coordinates values change for ArcGIS

I have received thousands of location information like below. X= 10°52.579 Y= 078°38.473 I don't have idea in which format is this, please let me know what is the format of this location and ...
2
votes
1answer
66 views

escape the cut of western/eastern hemispheres

I am very new to QGIS and GIS in general, so I am struggling with the following: when I do a map of Russia, I get the part next to Alaska being drawn far left from Europe, as it lies behind 180o... I ...
4
votes
1answer
245 views

Cannot compute area of shapefile in field calculator of QGIS?

This shapefile represents the counties of NM. I am trying to compute the area of each polygon (yes, I know there is an area field, but this is a simpler example of a problem I'm having which doesn't ...
2
votes
1answer
162 views

Viewshed analysis and coordinate systems ArcGIS 10.1

I am trying to run a viewshed analysis and I've downloaded DEM data from the UK ordnance survey (Landform-panorama). Since the data is in ASCII format I have created a seamless raster mosaic (and used ...
4
votes
3answers
3k views

How to convert projected coordinates to lat/lon using Python?

I assume this is a basic question but I can't seem to find or recognize the solution. This site returns Point: X: -11705274.6374 Y: 4826473.6922 when you searching with the first key value of 000090 ...
0
votes
1answer
795 views

Coordinate conversion - Lat Long to State Plane, ArcServer-Silverlight

I am trying to project a Lat/Long value I get from a table to a x/y value that I can use to plot a graphic. I have seen one way to do this may be to use something like this: feature.Geometry = ...
2
votes
1answer
307 views

Qgis OSM and layer projection problem

I am using QGIS 2.1.0, and trying to import my vector layer(parcels) with OpenStreetMap layer. My vector layer (parcels) use EPSG 31277 coordinate system. This is the definition for EPSG 31277: ...
1
vote
1answer
66 views

Custom tiles in local CRS

I want to achieve the following: Create an OpenLayers map, that runs totally in a local CRS. The basic layer would be a raster tile layer. The tiles will be generated by us once for each project ...
1
vote
2answers
804 views

QGIS 2.0.1. missing Google Mercator CRS

I've downloaded the latest QGIS version and I cannot add basemap. I installed OpenLayers plugin and while adding any map from list QGIS crashes. I tried to enable Google Mercator CRS first, yet it's ...
3
votes
1answer
113 views

How to get projected centroids in QGIS?

I am trying to get a centroid for several polygons on a global scale, in a way that it would correctly represent the common centre of all the polygons, taking Earth's curvature into account. The ...
2
votes
0answers
69 views

coordinate system for calculating distance at the nation scale

I want to use ArcGIS 10.1 to calculate the straight (euclidean) distances from zip codes to their nearest city centers in about 300 U.S. metropolitan areas. I have two point shpfiles: one includes the ...
1
vote
1answer
80 views

Question about quantum gis, and importing csv point data

I'm trying to add some point data from a csv file (it's in decimal degree lat lon) and overlay over road data that I already have added. The problem is that I can't get it to line up. I'm sure I'm ...
2
votes
1answer
218 views

In arcpy, if I subclass the arcpy Spatial Reference class, what is the object argument I would use in the subclass definition?

I want to do something like the following: class SubClassOfSpatialReference(arcpy_spatial_reference_object): def __init__(self, input_data): ... etc. Can I even do this? If so, what exactly ...
3
votes
2answers
87 views

Mixing coodinate systems

I'm planning to create an online map with openlayers (2 or 3) or leaflet. I have to show some points/markers (~30.000), polygons (~500) and lines in an area of ~10x10 kilometers in several layers. ...
2
votes
2answers
149 views

Set projection/CRS in map and shapefile to produce buffer

I simply want to create a buffer of a specific size, around a single point. When I create a buffer it uses degrees/ or radians, or whatever, and the buffer is created that covers the whole screen. I ...
0
votes
1answer
164 views

Geographic Coordinate system and Projected coordinate system [duplicate]

Please Excuse me If I asked a Silly question : When to Set A Geographic coordinate system or projected coordinate system to a Shapefile?
4
votes
1answer
596 views

In ArcObjects, how do I change the spatial reference of a Map (Data Frame) in an existing MXD?

I need to change the spatial reference of an existing MXD programmatically. In ArcMap UI, I would take the following steps: 1) Open the data frame properties and go to the Coordinate System tab; 2) ...
1
vote
2answers
120 views

How do I Fix Projection Issues in QGIS

I have some exiting shape files that supposedly have a CRS of OSGEO:41001. If I import new data, and set the CRS to OSGEO:41001 they do not align. If I change the CRS of the new layers to ...
4
votes
0answers
64 views

EPSG code as dynamic text in ArcGIS

Is it possible to get ArcGIS to show the EPSG code for a coordinate system as dynamic text? The default text is quite verbose (see below), and I think just showing the "Coordinate System" is probably ...
1
vote
3answers
1k views

Formula/ calculation for ESRI map coordinate conversion (meter to decimal degrees)

I'm new to ESRI mapping. I have a set of points in ESRI, with x, y, z coordinates, which I believe is in meters. I am now writing an Android program, and I do not want to depend on ESRI, thus I would ...
1
vote
2answers
174 views

Extent and Projection on ASTER issue on my ArcGIS 10.1 ArcMap?

On my previous post on my ASTER issue, ASTER extent or projection issues. I decided to revisit on this issue. I am still puzzled as to why my ASTER has geographic coordinate system on its extent but ...
2
votes
1answer
221 views

Change coordinate system of a WMS service

I have a WMS service that is projected to UTM/SAD-69. My workspace is in WGS-84 with no projection. I want to change the coordinate system of my WMS service. Is it possible in ArcMap 10.0? The wms ...
5
votes
2answers
828 views

Stereographic projection of WGS84 ellipsoid on a plane[python]

I would like to ask you for help in following task. What I need to do is to derive local x,y coordinates from latitude, longitude, applying stereographic projection of WGS84 ellipsoid on a plane, ...
1
vote
1answer
77 views

How do I know the cause of my spatial error?

A (probably?) very basic question about spatial error it's about time I knew how to think about and answer correctly. I have some data plotted from XY coordinates. I look at them and it turns out ...
2
votes
2answers
355 views

Stereo 70 where is it?

I have ortho photos of Romania in Stereo 70 and GPS data in WGS84 of the same country : I want to associate the two series of data. At the moment, I can't find Stereo 70 in the list of CRS : does it ...
2
votes
1answer
50 views

Questions about EPSG:6372

I'm using QGIS 1.8.0 and as CRS EPSG:6372 a projection for Mexico, defined by the Instituto Nacional de Estadística y Geografía (INEGI). I have the following questions: If I measure the minimum ...
2
votes
1answer
228 views

Waterman Projection in ArcMap

Anyone have any idea how to create (or where to find) the Waterman "Butterfly" projection in ArcMap?
2
votes
1answer
97 views

QGIS layers don't overlay after trying 'enable on the fly' and CRS settings

I know there are already many questions about this topic, but none of the answers helped me so far. I have two layers I want to overlay in QGIS. One of them is an Excell file with the coordinates of ...
3
votes
1answer
204 views

QGIS display does not reflect projection

I have slight experience with ArcGIS, but am new to QGIS. I'm trying to set the projection of my map, and I understand that this is done by altering the CRS (coordinate reference system) of each ...
2
votes
0answers
19 views

arcmap envelope coordinates from webbrowser tool

So I have my own php file with textfields which I run in my add in. Now I want to get the variables from the textfields and automatically give the value of the textfields to my env.PutCoords(x,y,x,y) ...
2
votes
1answer
114 views

Problem converting coordinates

I'm trying to convert punctual values from lat/long to EPSG:6372, a projection for Mexico, defined by the Instituto Nacional de Estadística y Geografía (INEGI). I found a converter online but somehow ...
2
votes
3answers
145 views

Can someone recognize the CRS?

I'm using QGIS 1.8.0 and have some shapefiles with a "User Defined CRS" which I don't recognize. Is anyone able to recognize it? Here is an image of the settings I see on QGIS. Thanks in advance. ...
2
votes
2answers
99 views

How to set my own CRS in QGIS

I want to transform WGS to MRT (GCS for Malaysia) using QGIS. Is "save as" to a new CRS the correct method? With ArcGIS, I can create transformation method to do transformation but I'm not sure in ...
2
votes
0answers
40 views

Layers with the same Geographic Coordinate system don't overlap [duplicate]

I am a GIS newbie. I'm having a problem that, from the looks of things on this website, is a fairly common problem. I have 3 layers, all in the same GCS that do not line up. I have read all the the ...
3
votes
1answer
142 views

How to change the settings for where ArcGIS splits world data

I have a world map made up of 6 shp files. All the files and the data frame are set to WGS84. The way Arc 10 and 10.1 decides to display the files, it splits Russia into 2. The majority of Russia ...
3
votes
1answer
933 views

How to convert to Australian Height Datum from Google Earth elevation?

I am trying to figure out how to convert from Google Earth elevation to Australian Height Datum (AHD). Google Earth's elevation / altitude is based on The vertical component (altitude) is measured ...
0
votes
0answers
250 views

Why do my maps exported in WGS84 have large coordinates?

I'm using QGIS to export map layers as GeoJSON for use in Leaflet. The map file CRS is WGS84(EPSG4326) and I'm exporting it as such. The issue is the exported coordinates are still too large: [ ...