Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.

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1answer
119 views

Which EPSG for UTM with 8 digits in QGIS

I have a UTM datasets with 8 digits, so the first digits are 32 (for UTM Zone 32N), but which EPSG should I use to get the data at the right spot in QGIS in a 6 digits system. If I want to transfer ...
2
votes
1answer
40 views

Atributing fields in arcmap and excel

How do I populate a field in ArcMap (and Excel) with only a specific part of another field's attributes? For example: I want to populate the LATDEG field with only the degree part of a latitudinal ...
2
votes
2answers
167 views

How to draw a square from 2 coordinates?

I have a CSV file with the following output id, x min, y min, x max, y max, value 1 , 0 , 0 , 100 , 100 , 5 2 , 0, , 100 , 100 , 200 , 10 3 , 100 , 100 , 200 , 200 , 15 4 , 100 , 0 ...
2
votes
1answer
396 views

Haversine formula to calculate distance between real coordinates?

I need to calculate distance between two stations in a map in order to calculate empirical variogram in ordinary kriging to interpolate temperature data. Calculating distance in kriging using ...
2
votes
1answer
394 views

Moving a shapefile point to specific coordinates

In QGIS is there a simple way to move a shapefile point in a shapefile point file to specific coordinates? Without exporting the points to WKT changing the x,y values and then importing the WKT via ...
2
votes
1answer
213 views

How do I calculate the coordinates of the median point of a polyline?

I have a shapefile with some polylines. For each one of these polylines I'd like to calculate the median of the polyline (i.e. the point that's equidistant from each end) and then, calculate its ...
2
votes
1answer
329 views

Why is field calculator returning NULL for $x and $y in line and polygon layers?

I am trying to include XY coordinates in the attribute tables of several of my vector files; they are line and polygon files. I have tried two methods; first I used $x and $y in the field calculator ...
2
votes
1answer
320 views

Adding UTM Zone Number to Coordinates

The computer program that I'm working with requires an 8 digit UTM Easting for the coordinates of shapefiles (i.e., the UTM zone number must be included with each coordinate within a shapefile). The ...
2
votes
1answer
288 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): ...
2
votes
1answer
349 views

How to flip X and Y coordinates of a grid by GDAL

I have a grid, which has flipped X and Y coordinates (X is represented by Y values and Y is represented by X values). This results in grid being positioned in completely wrong place. How can I flip ...
2
votes
1answer
83 views

Latitude and Longitudes are replaced with zeros when importing excel 2007 worksheet into personal geodatabase

I am trying to import an Excel 2007 data set into a personal geodatabase so I can convert coordinate systems. The data set includes point locations in Decimal Degrees. When I import the Excel ...
2
votes
2answers
653 views

How to transform Lambert coordinates in C#?

I want to transform Lambert (EPSG:3035) coordinates to EPSG:4326 in C#. I have tried this: var lambert = cf.CreateFromWkt("PROJCS[\"ETRS89 / ETRS-LAEA\",GEOGCS[\"ETRS89 ...
2
votes
1answer
2k views

How to make a predetermined Polygon (Circle) From 4 Coordinates, The Radius and Center Longitude and Latitude in Openlayers

I know how to make a predetermined Polygon in Openlayers (see below). Please have a look at http://studio.netnrg.co.za/dev/rnd/blake.loizides/openlayers var feature2 = new ...
2
votes
1answer
648 views

Looking for a pure Python method to convert Lat/Long To MGRS

Does anyone know of any packages out there that implement a pure python method to convert lat/long coordinates to MGRS coordinates? PyPi has a package, but it requires some c-extensions from ...
2
votes
1answer
30 views

Is nearest search done on Euclidean plane accurate

I am writing a program which will find all the points within 1km. I am planning to to do this on a Euclidean plane as my database only supports Euclidean plane or sphere indexing ...
2
votes
2answers
113 views

How to handle coordinates accuracy in ArcGIS

I am creating very basic rectangular polygon using very basic a Python code nCols,nRows=100,100 corners =[[0,0],[0,nRows],[nCols,nRows],[nCols,0],[0,0]] ...
2
votes
1answer
18 views

Grids not originating from 2D parameter spaces

Is there any specific name for grids on sphere (or geoid, or any other manifold/surface) that do not originate from 2D parameter space? For example generating a grid on a sphere using icosahedron ...
2
votes
1answer
74 views

Conversion of CSV file in MyGeoData Converter - XY columns not recognized

Recently I have tried to import various CSV files with XY coordinates to MyGeoData Converter. In some cases I got a message: Selected data does not have a spatial part! For example, this file ...
2
votes
1answer
156 views

Comparing two maps with two different libraries

I'm currently making a demonstration to compare the two OpenLayers libraries (2 and 3). For doing this, I have made two div elements and put the different maps on each other. The goal is to make a map ...
2
votes
1answer
101 views

Get feature data from lat long input QGIS

In QGIS, I have a polygon dataset with feature data. I would like to extract data from this dataset using a latitude and longitude. To be more clear, I have a list of 1000 coordinates. I would like ...
2
votes
3answers
360 views

How to convert PCS based point X/Y into GCS Lat/Lon using ArcObjects

There are so many permutations of questions I've tried to find the answer to my question from various sources, but I have yet to actually find an answer the way that makes sense to me (and works). ...
2
votes
1answer
121 views

WorldWind wms services show reversed coordinate in ArcGIS Desktop

I'm adding WorldWind wms services (http://data.worldwind.arc.nasa.gov/wms?) to ArcMap (ArcGIS 10.2.2) but maps are misplaced, looks like they have reversed coordinates (as explained here: ...
2
votes
1answer
990 views

Adding graticules to the edge of the map only in QGIS

I would like to add graticules to a map, once it is in the 'print composer', on the border of the map, and not on the frame (my map insists on being smaller than the frame). I have managed to add a ...
2
votes
1answer
113 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, ...
2
votes
1answer
249 views

How to smoothly join two rectangles

I am looking for the Math and steps involved not using a tool. We have PostGIS but its an old version so we are working with the data in Python. Given three coordinates: -107.37, 52.46 -103.24, ...
2
votes
1answer
687 views

How can I show points on the same coordinate as e.g. a bigger symbol in QGIS?

I use QGIS 1.8 for mapping archaeological findings. Some of the findings within one layer are located on the same site and therefore have the same coordinates. Therefore you just see one point instead ...
2
votes
4answers
903 views

Get coordinates from address

I am writing a application which allow users to save a address into database (db) and in the next step it shows all addresses on a map. But in the saving step I need automatically calculate a GPS ...
2
votes
1answer
1k views

Getting polygon shapefile node coordinates and point order

I am trying to get the coordinates of each node of a polygon in QGIS. What I basically did is use the following tools: Vector -> Geometry tools -> Extract nodes Vector -> Geometry tools -> Export ...
2
votes
1answer
509 views

Retrieving XY from point graphics set in WPF network (arcgis 10.0)

I have a WPF application using ArcGIS 10. In the application I can set two point by clicking on map and calculate route between them. every time I click on the map, The application creates a ...
2
votes
1answer
3k views

Trying to set the OpenLayers MouseOver position to be outside the Map

This is my code and I am trying to obtain the MouseOver to be displayed outside the Map container. <!DOCTYPE html> <html> <head> <title>My Map</title> ...
2
votes
1answer
2k views

How to find bounding coordinates (lat/long) for UTM zones?

I want to error check incoming lat/lng points by checking if the point resides within the given UTM zone. (This would work for the data im using because sometimes there is a missing sign or lat/lng is ...
2
votes
1answer
697 views

Read .DEM (USGS) FIles with C#

I have a huge number of .DEMs and have been investigating how to process them into something useful. Does anyone know how, or even if it is possible to read coordinates and elevation data from ...
2
votes
1answer
18 views

Qgis load a set of excel points into a googlemap with only one point with real coordinates

I am working with a google map on which I want to attach a grid of five points. Only one of them has real coordinates in the centre, point O ( 8.32688E, 48,32933N). For all the rest only the excel ...
2
votes
1answer
16 views

How to find the coordinates of the intersection points between two SpatialLines objects (or SpatialLines and SpatialPolygon edges)

I am try to find the co-ordinates of points where SpatialLines cross the edge of a SpatialPolygon. I have searched and searched, but can only find results such as over which tell me which lines cross ...
2
votes
1answer
40 views

How do I make a hexgrid in QGIS with cell identification numbers

I'm getting started with QGIS as part of my interest in military science and wargaming. I'm running into a problem adding identifiers (column and row) to the hexcells that I've created with mmqgis. ...
2
votes
1answer
37 views

How to create a raster of equidistant points with distance in meters using QGIS?

I need a set of equidistant points (like a raster) each in a 1km distance to the next over a certain area, in my case Germany. I know the feature "regular points" in QGIS where I can do just that but ...
2
votes
0answers
33 views

tfw world file in decimal degrees?

I want to understand how "world files" are created. I found some definitions, like: http://en.wikipedia.org/wiki/World_file which says that the 2 last lines in the file are x and y coordinates of ...
2
votes
0answers
122 views

Calculating lat/long coordinates from DLS (Dominion Land Survey) Location

I am trying to calculate the legal subdivision center of a DLS location and even when I try the simplest calculation my numbers are always off from other calculators. Take for example DLS location ...
2
votes
1answer
96 views

Populate X and Y fields in SDE Point Data Using SQL trigger

Here is my situation. I am running ESRI ArcGIS Server and Desktop 10.2 on SQL Server 2008 R2. I would like to populate the Latitude and Longitude fields from point data (Signs data collected using ...
2
votes
0answers
285 views

Inserting coordinates from Google Maps into a Database

My question is pretty basic. I am using Android Google Maps to take the coordinates off a location on the map and I want to insert it into a PostgreSQL database. I know I have to use PostGIS but how ...
2
votes
1answer
63 views

How to use qgis coordinate transformation in user code

I am now working with coordinate transformations between different CRSs, e.g. latlong to UTM. After comparisons, I found out that the coordinate capture plugin in QGIS is quite accurate for the ...
2
votes
1answer
50 views

warping and outputting coordinates of GeoTiff data: advice and error checking

So I have a massive TIF file (projected in Lambert azimuthal equal-area), and I'm trying to get lat/lon coordinates for each point of the grid. My first step is to warp the projection to the WGS84 ...
2
votes
0answers
154 views

Calculating Distances between coordinates

I have perused through the other questions that are very similar to mine but am still having some trouble. I have 75 coordinates in WGS84 that I brought in from an Excel table. They are now on my ...
2
votes
0answers
77 views

Getting XY screen coords from ArcScene 3D point using ArcObjects?

I already know how to convert screen point (X,Y in pixels) to 3D point: ISceneGraph pSceneGraph = m_pSceneHookHelper.SceneGraph; IPoint pPoint; pSceneGraph.Locate(pSceneGraph.ActiveViewer, X, Y, ...
2
votes
0answers
68 views

Choosing the map scale (1:nnn) for the given raster dimension

Starting points: let define the raster image size, say: 1800x900 pixels I want draw my own raster image map - by drawing polygons e.g. like "draw line from pixel with coordinates x100y100 to pixel ...
2
votes
0answers
53 views

Problem with finding point within the box in MongoDB

I'm doing a search within box. It works perfect except only one situation. Let me describe it. Suppose the point has coordinates: (lng:-155, lat:19) If we have box: sw - (-170, 10), ne (29,69) that ...
2
votes
0answers
40 views

Decimal degree coordinates: how many decimal places to use for …? [duplicate]

When using coordinates in decimal degrees, how many decimal points actually make sense? For example, say one is producing a table of locations of base camps in a report, there's no point in ...
2
votes
0answers
49 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
votes
1answer
339 views

Determine when I have crossed state line?

We are currently using the Google Maps API to get route information and total mileage but we would like to determine when we are crossing into a new state. When we return the route information we can ...
2
votes
0answers
141 views

How to locate a house on the 3D Map correctly?

I've done my 3D map generation in WebGL/THREE.JS project and have an issue with the building locations. I have the data about building position ( its polygon ) from DB server, but first of all I want ...