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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4
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57 views

How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing ...
4
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0answers
417 views

Hexagon binning using Google Maps

I have a bunch of geolocated points that I am looking to cluster on a google map using hexagons. These clusters will be stored in a db for quick retrieval and will be reduced to a single point and ...
4
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0answers
102 views

Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?

When adding data from PostgreSQL in a Query Layer I get the warning: The given coordinate references are incompatible I have added many other layers with the same properties no problems, but I ...
4
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0answers
323 views

Can GeoTools parse GML CRS definitions?

A kind of branching of this question. Soon I will need to handle GML Coordinate Reference Sysyem definitions in a Java servlet. Links: GML OGC reference. Concrete example. I know that GeoTools ...
3
votes
0answers
89 views

Overlaying WMS in custom coordinate system with other layers in openlayers 3

I have a raster in a custom coordinate system (I added the coordinate system definition to the geoserver EPSG file so that I could choose it as the native projection. Now I would like to add it to a ...
3
votes
0answers
82 views

Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real ...
3
votes
0answers
51 views

Do locations “move” when shifting datum?

I hope that this is the right Stack Exchange for this question. I may be oversimplifying this, but I'm looking for verification in my understanding of the following: If I have a spatial dataset in 2 ...
3
votes
0answers
75 views

Which spatial-reference system is used by the Haversine formula?

I've been reading Pro Spatial with SQL Server 2012. It discusses the various spatial-reference systems (SRS) that can be used when defining a coordinate system. According to the book, Google uses ...
3
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0answers
37 views

Error in Measuring distance using QGIS?

I am using the current Qgis 2.6.1 and having problems using the measuring distance function. The 'Measure Line' is giving me distances which is completely wrong and the scale shown was too big also. ...
3
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0answers
215 views

Is there a way to expose Spherical Mercator Lat Lon in Google Map API?

The map tiles in the Google Maps are in Spherical Mercator projection (srid 900913), but in the API the methods report coordinates in Lat/Lon WGS84, e.g. map.getCenter(). Is there a way to return the ...
3
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0answers
129 views

Unknown gridlines on old Greenland base map!

Can anyone help me out please? I'm using an old 1:10,000 base map of Greenland for a mapping project with nice 10cm gridlines already drawn on. However it uses a coordinate system which is unfamiliar ...
2
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0answers
44 views

Converting KML coordinates to Leaflet

I am trying to convert a Google Map KML file to a csv, to map the longitude and latitude points on Leaflet. But the coordinates keep mis-projecting and some end up off the land mass. The steps I have ...
2
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0answers
34 views

Creating Proj4 string for local coordinates

I am fairly new to coordinate system conversion, so am rather lost on the following problem. We have been using Proj4 to convert between various coordinate systems which is fine for known coordinate ...
2
votes
0answers
48 views

How to instantiate a new map with proj4leaflet projections from a Bootstrap dropdown menu

I'm currently working on a Leaflet website that will be able to display GPS-Tracks with different projections. Now I'm trying to implement a dropdown menu based on Bootstrap, where I can set different ...
2
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0answers
88 views

Find gravity normal by ECEF or GPS coordinate of point

How to find gravity normal by ECEF or GPS coordinate of point? Is it the same as normal to elipsoid? Is this ordinary way to calculate normal to ellipse? I'm not quite sure which altitude is ...
2
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0answers
62 views

Changing projection on each page of data driven pages

I am working with data driven pages and a raster image of the world. I have a separate polygon shapefile of all of the UTM zones (with a polygon for zones 1-60, north and south, for a total of 120 ...
2
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0answers
63 views

Can 2 GIS layers which representing the same area be compared directly while having the same datum but different coordinate system?

My question is about how coordinate systems affect comparison of different layers - I have tried to refresh my memory about coordinate systems in GIS, but am still unsure about this situation. I am ...
2
votes
0answers
71 views

Extracting Multivalues to Points from NETCDF4 Raster using ArcPy seems imprecise?

I'm getting some strange results in a multivalues to points extraction from a NETCDF4 layer from the MERRA reanalysis product. In particular, it seems like the values being assigned are way off in ...
2
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0answers
35 views

Using points in polygons tool with QGIS and CRS?

I am working with 2 layers. 1 shows a polygon of a district and is in CRS EPSG 4326 and another layer (address layer) is in CRS EPSG 3082. I right click the address layer and "save as" and specify ...
2
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0answers
61 views

Equal distance points on polylines

In QGIS 2.10.1 I want to create a point layer out of my polyline shapefile and all the points shall have a fixed distance (in meters) while I use WGS84 as coordinate system. So what do I use for this? ...
2
votes
0answers
186 views

Converting local XYZ to geographic coordinates

I am working with a computer program called PEP for Windows by Airbus, which is able to calculate exact flight paths of an aircraft, based on many inputs like weight, temperature, wind, etc. The ...
2
votes
0answers
87 views

ESRI/Mapinfo MGA56 prj vs QGIS MGA56 prj

I am trying to understand why the degree unit is different between ESRI/Mapinfo and QGIS: ESRI/Mapinfo ...
2
votes
0answers
49 views

How do I trick QGIS's map composer into chopping off the 000's in UTM coordinates?

In QGIS 2.8 (ubuntu), you can create a map with ticks and labels. I want the first two digits to be smaller sized, the next 3 to to be normal sized, and hide the last 3 digits. QGIS does not offer ...
2
votes
0answers
115 views

Problem when converting to LCC projection

I am very much so a beginner.. but here goes. I have two maps that should line up with each other, but their projections are different. I've tried to use the gdalwarp utility to match them up, but ...
2
votes
0answers
211 views

Longitude and Latitude Mixed Up on Map

I am trying to map a WFS layer with data originally coming from a PostGIS table, and using a OpenLayers 3. At some point in this process, I believe the longitude and latitude coordinates are getting ...
2
votes
0answers
144 views

What is causing invalid spatial reference error using ogr2ogr converting PostGIS to FileGDB in a Feature Dataset?

I am trying to use ogr2ogr to convert a layer from PostGIS to a FileGDB. I want the layer to be created inside a Feature Dataset. The spatial reference of the source layer is EPSG:3500. The spatial ...
2
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0answers
69 views

QGIS CRS correct, but layers appear warped

I am trying to overlay a raster Landsat 8 scene and vector scene boundary. Both are using WGS 84 + UTM48N. However, the vector (orange line) appears offset when overlaid on the raster. I have checked ...
2
votes
0answers
137 views

Mine Grid to UTM

I have been given spatial data (lidar) that was collected in mine grid feet in ASCII format. I am using arc to process but need to define a projection does anyone know how to do this or any other ...
2
votes
0answers
65 views

Reference and Beacon Stations in Vietnam

I'm not sure if this question can be asked in this forum, but here it goes. I am on my way to conduct some remote sensing research in Vietnam, which includes logging of coordinates. This should ...
2
votes
0answers
639 views

Returning distances in meters from Near (Analysis) tool of ArcGIS for Desktop?

I'm trying to write a python program that returns the distance from each point in a set to the nearest road. Specifically, I was looking for any points within 10 meters of the roads. Both sets of ...
2
votes
0answers
288 views

How to get a native srs and declared srs of layer using gsconfig?

How we can get native SRS and declared SRS of existed layer in GeoServer? I'm getting up to layer name available in a particular store and work space. The code as follows from geoserver.catalog ...
2
votes
0answers
67 views

Is it safe to store coordinates on NFC tags always in one CRS and rely on conversion for others

I'm involved in NFC (Near Field Communication) standardization of a record structure for geographic point locations. That will allow to put coordinates on NFC memory tags which can be read with a ...
2
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0answers
828 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
0answers
153 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 ...
2
votes
0answers
21 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
0answers
2k views

How do I change from lat/long to a metric coordinate system in GRASS?

Yes, it's yet another transformation question. I am working with ASTER DEM data, which is LatLong WGS84. I want to process the DEM map into an STL file for use in a CFD simulation. The script I am ...
2
votes
0answers
225 views

Height of the geoid in ECEF coordinates

I know that the relationship of geoid height N and ellipsoid height h to orthometric height H is defined by H = h - N, but what if I have some position in Earth-Centered-Earth-Fixed (ECEF) ...
2
votes
0answers
458 views

PyProj/Proj4 convert geographic to projected coordinates for Geostationary Data

I am trying to convert geographic coordinates (in degrees east/north lon lat) to projected coordinates in meters for geostationary full disc data (GVAR Goes East data from CLASS). To do this, I tried ...
2
votes
0answers
704 views

Problem with Create Fishnet on a Landsat footprint

I have a Landsat footprint polygon shapefile that I simply want to create a 6 x 6 fishnet on. I thought this would be simple, but every time I run the tool I get a fishnet output that extends longer ...
2
votes
0answers
228 views

How to decode Magellan URL coordinates to lat/lon

Magellan uses this URL to designate a coordinate in New York: mgn:///address/?coord=merwFvlqbM,name=Viva%20Herbals%20Pizzeria,number=179,street=2nd%20Avenue,city=New%20York,country=US How can I ...
2
votes
0answers
108 views

When using OpenLayers plugins maps, can I have Longitude/Lattitude labelled on my grid when using the Map composer in QGIS?

Using OpenLayers plugins maps, can I have Longitude/Latitude labelled on my grid when using the Map composer in QGIS?
2
votes
0answers
140 views

Changing CRS crashes QGIS every time

When I open QGIS, and use the tools, setting -> project properties, QGIS will crash. When I also use the setting -> option -> CRS , Select new CRS also causes a crash. It looks like couldn't use the ...
1
vote
0answers
46 views

Change coordinate system to add buffer in meters

I have am trying to add functionality to allow users to find points that are within a buffer distance inside or outside the parameter of a polygon. The map is in IProjectedCoordinateSystem so to my ...
1
vote
0answers
20 views

Which SQL Server spatial data type to use for UK data in SQL Server?

Which spatial data type should be used for UK data in SQL Server?, i.e. GEOMETRY or GEOGRAPHY? I'm aware of OS National Grid and my understanding is it's an X/Y coordinate system, covering from ...
1
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0answers
16 views

Raster from Ascii text file doesn't project properly

I created an ascii grid of annual precipitation for CONUS in MATLAB and imported it into Arcmap. The text file can be downloaded here: https://www.dropbox.com/s/0k4x257x597ogij/meanTotalPmm.txt?dl=0 ...
1
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0answers
45 views

Delete CRS in QGIS

Is there a way of deleting the various CRS's that QGIS lists? We are a Local Authority in England and the only CRS we need is British National Grid, which is set as the default, as well as Lat/Long ...
1
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0answers
22 views

Custom ArcMap 10.3 Projections?

I'm still pretty new to GIS, being a new EIT at a civil engineering firm. Im here to find out if ArcMap has this certain projection. If so, how do I access it? In ArcMap the projection currently says ...
1
vote
0answers
18 views

SRIDs do not match for the two geometries in oracle spatial

I am trying to resolve where some points from Point Geometry lying outside the Polygon geometry. I want to filter those points which are lying outside the polygon geometry. I am getting error where ...
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0answers
24 views

Get Coordinates

I have the following tif metada: Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): ...
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0answers
13 views

How can I change the name of a coordinate system in SAFE FME?

Every time I use SAFE FME to write data in the coordinate system EPSG:25832 FME names it NUTM32. I them have problems reading the data in ArcGIS Desktop because it doesn´t recognise the name NUTM32. ...