# Tagged Questions

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.

146 views

### get lat/lon values of every start and end point of polyline

I have a polyline shapefile with 166 different line features. How would one populate the attribute table with x and y values of the start and end points of each line?
489 views

### Coordinate extraction in a different projection in MapInfo

I have a .TAB file of polyline objects in British Grid Coordinate. I need to extract the end points/nodes of each polyline and find their latitude/longitude (WGS84).
41 views

### How to set a python code to trigger on any update on a feature class

For example, when I have a geometry change on a point, I would like to update the X and Y fields to the new current location, I understand how to make the code, but not where do I set or put it to be ...
4k views

### Calculating coordinates of square x miles from center point?

I am trying to create a x mile square (or circle) around a central point, where all sides of the square would be x miles from the centre. I need the 4 corner coordinates. It is scrambling my brain ...
20 views

### Why does Print composer draw wrong coordinates?

QGIS Version: 2.14.3 EPSG: 32630 (WGS 84 UTM Zone 30N) I´m trying to draw a grid with EPSG: 32630. Layers are in the same CRS. As you see, coordinates are completely off. It does not matter if I use ...
281 views

### SharpMap Coordinate transformation Problem

I want to transform my layers from SRID 31463 (Gauß Krüger) to Webmercator. Since SharpMap does only know webmercator and WGS84 i tried to create the Coordinate System 31463 by WKT and applied it on ...
33 views

### Calculate latitude and longitude on the arc given radius

I have two points with known latitude and longitude. What I need to do is to draw an arc between these two points on a map. So, I use the following algorithm: Find the latitude and longitude of ...
239 views

### How to measure distance between two coordinate pairs taken from NMEA file?

In order to measure momentary speed, first I need to measure the distance between two pairs of coordinates. That's where my lack of knowledge stops me. I have example data in NMEA format: \$GPGGA,...
226 views

### Can layers with different extents in arcmap 10 be made to line up?

I am currently trying to get some insect sampling coordinates that are represented by points to project on top of a polygon that shows all the different plots of land in a ranch. The coordinates for ...
20 views

### Export csv-coordinates to JSON - square brackets [closed]

I´ve got multiple point-layers that I want to join in a single JSON-file used for webmapping. The layers is to be listed in column by column like this: [55.778659,12.151137 ], [55.77272358,12....
22 views

### How to get (x,y) coordinates given MinGX, MinGY, MaxGX, MaxGY? [closed]

I have a set of data that stores the MinGX, MinGY, MaxGX, MaxGY values of each location. I need to find the (x,y) coordinates of these locations. Is there any way to do this without using/downloading ...
583 views

### How to plot lat/long stored as text in Oracle DB using report builder/SSRS r2

We use an Oracle 10g database. However we write reports using SSRS or report builder, using the Oracle connection type to the datbase. In oracle we have 2 text fields, one for lat and one for long. ...
21k views

### Creating shape file from file with coordinates

How can I make a shape file of an csv file with coordinates?
23 views

### Create a turf polygon from extents to check intersection with other polygons

I am storing the bbox of layers as strings, as the following string : var layerExtent='[768039.2602094524, 5772524.37609651, 2313901.7202488566, 7435794.111581946]' and I'm using this method to ...
156 views

### Determining coordinates of a SHP file

i have a SHP file of a building converted from a DXF file. This SHP file is unprojected and have no specific coordinates (origin 0,0). I find WGS84 coordinates (lat, long) of this building from Google ...
18 views

### Defining a local CRS that is basically UTM31N rotated by 43.22 degrees

Working with some data in the North Sea and basically I'm a bit fed up of working at a slant of 43.22 degrees. I was thinking it must be possible to define an orthogonal local coordinate system as a ....
79 views

### Coordinates from Excel list

I'd like to import Coordinates from an Excel list, for this reason I saved the excel sheet as an .csv ant tried to import it via "Layer --> Add delimited text Layer". The points are imported, but with ...
570 views

### Plotting X, Y coordinates generated from MySQL database in QGIS

Currently running QGIS 1.8.0 on Mac OS X 10.8.4. I can plot points on a map using the "Add delimited text layer" plugin to get x-y coordinates from a text file. However, I'd like to be able to ...
57 views

### Converting a CSV to DXF using ogr2ogr from the command line

I am trying to convert a .csv file to .dxf using ogr2org from the command line using the following command: ogr2ogr -f DXF control.dxf opua.vrt This is the .vrt file I am using: <...
11k views

### How to move vectors to specified coordinates in QGIS?

I have a layer of vectors located around, say, (100, 100), and I want to move them to new coordinate like (1000, 1000). How should I do it? Preferably using QGIS.
29 views

### Plot x,y coordinates on a Polyconic Map Projection

I have an image of a large polyconic map projection: (Note that the actual image is much larger, I just made it smaller to upload it.) I would like to take in a user's GPS coordinates and plot where ...
40 views

### Arcgis FeatureLayer.MODE_ONDEMAND not select exactly coodinate?

I'm working with ArcGis API. I push my Feature Layer on map in MODE_ONDEMAND. But when I select feature (selectTask), the coordinates come out as [692010, 101011], with no decimal places. What I want ...
179 views

### Finding coordinates of the image corner

I have a .bmp image with a map. For creating image i used a Ingeo 4.4 and function MakeImage() What i know: Height an Width of bmp image dpi Map Scale Image Center's coordinates in meters. What i ...
54 views

### How to create polygons associated to coordinates (QGIS)

I'm trying to create polygons associate to given .csv files. On the polygon I would have to be able to read the coordinates x, y (AND Z) because I need to interpolate points and work with them. I know ...
489 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 ...
1k views

### How to make coordinates match between Google Maps and matplotlib.basemap

I'm trying to plot some data with matplotlib and basemap, but I have trouble making the coordinates match between Google Maps and basemap. For example, I click at a distinctive feature on the map in ...
39 views

I am having some issues adding x y coordinates from Google Maps into ArcMap. I am adding the following table to ArcMap by specifying X-Field as longitude, and the Y-Field as latitude:. However, when ...
321 views

### How to get coordinates by click on map and send coordinate to MySQL?

I'm building my own web map. Now I want to get the coordinates by click on the map and send the coordinates to MySQL. I tried OpenLayers to get the coordinates from Openstreetmap,but I didn't know ...
81 views

### Importing LiDAR .txt in QGIS for map conversion

I have LiDAR data in .txt files (1000 to 26000 KB), where 2nd column marks x-coordinates, 3rd col y and 4th col z. 8 485000.16 6508997.48 1.84 66 Last 2 485001.27 6508998.92 1.86 82 Last 2 485001.02 ...
4k views

### From coordinates find country using Python

I have tweets with coordinates. I'm trying to bucket the tweets by country using the coordinate information. I know that I can achieve this using some hosted web services but all of these have API ...
351 views

### Check if a point cordinate is between linestring cordinates

I know that, linestring is a vector and if i want to check that, if point cordinates are between linestring begginning and ending cordinates then i need to use vector comparison (x2 > x && ...
111 views

### Shifting LiDAR point clouds that have been incorrectly georeferenced

I am new to LiDAR and have never been a part of the LiDAR data pre-processing stage and hence, this question. I have two LiDAR point clouds (.las files) of a densely forested area that were captured ...
7k views

### Convert geometry to latitude-longitude using PostGIS ST_Transform

My table has a geometric field, in EPSG:3857, of type point. I need the latitude and longitude, in EPSG: 4326, of each point. Could someone give me a valid example of how to use ST_Transform().
128 views

### Using twitter coordinates in OSGeo library

I have twitter data with coordinates such as: [-7.2377761, 112.73091137] I'm working with a python geo library called osgeo. The sample code indicates creating a point like this. point = osgeo.ogr....
191 views

### find border coordinates of brazilian states

I am looking for coordinates (longitude and latitude) of each state of Brazil. Where can I find that? I have found a file for the US states here: http://econym.org.uk/gmap/states.xml, I am now ...
34 views

### KD-Tree implementation with lat/lon coordinates

I have implemented a KD-Tree that stores coordinates (latitude, longitude). I have also implemented a Nearest Neighbor search algorithm using the Haversine distance. Will I get correct results (same ...
18 views

### Grid doesn't show up in printer composer

I am trying to get a coordinate grid on my map with the printer composer. I have tried every example and followed it exactly but for some reason the grid doesn't show up at all. I am working with Qgis ...
41 views

### Project (lat,lng) GPS point to a line segment (road segment)

Is there a way to project a point A to a B,C line segment and find a point D ? The points are latitude, longitude points, so I believe we should incorporate the haversine distance formula. Edit: I am ...
720 views

### What format is a location represented like this?

While converting an old system, I came across a position column with values in a format like this: 38RQT6410550656 While I've never seen global positioning represented this way, putting this in ...
128 views

### Postgis How to populate column with geography data from geometric data?

I stored my point date in geometry format with SRID 4326 supposed EWKB (data looks like this "0101000020E610000071F1A611E9392640AECD10D8E68C4A40") = way geometry(Point,4326) I want to have the ...
32 views

### Postgres/postgis st_makepoint

I am looping through a csv, taking latlng values and trying to add there geometry to postgis enabled postgres table. xy values are int's conn = psycopg2.connect("connected") cur = conn.cursor() cur....
54 views

### Adding XY coordinate to map in ArcGIS (not in dataset)?

Is there a quick and easy way to add an XY coordinate in ArcGIS outside of creating a table? A coworker just wants to see what that point is on a topo background. I just want to see where a ...
61 views

### Inverted lat lon on drawn polygons in Openlayers 3

I am working on a map in openlayers 3 with geoserver I display the layers as WFS and I added the draw and modify interactions, but when I save the drawn polygons the coordinates of the newly drawn ...
49 views

### Which points in projected raster corresponds to certain latitude,longitude location?

What I have is a SRTM 3 arc-second raster file in WGS84 geographic coordinate system (here is that file). I then project it to the Azimuthal Equidistant projection with GDAL: gdalwarp -s_srs EPSG:...
51 views

### Fill array with coordinates within geographical bounds in Leaflet

I want to create an array and fill it with geographical coordinates I get from a bounds variable. Basically, a for-loop shall create coordinate pairs within the specified bounds with a fixed distance ...
30 views

### Wrong calculation of line start and end XY coordinates of a merged line- how can I fix this?

I have a feature class containing several rivers, which are derived from merging individual river segments to make a continuous line. They have been merged using the editor tool. I have calculated ...
986 views

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### Converting polylines coordinates stored in PostGIS in column type text, in another column type geometry(MultiLineString,2154)?

I want to draw a polyline on a leaflet map and then send it to PostGis with php. I’m drawing my polylines using the Leaflet draw plugin and send the coordinates in a column “coords” in PostGIS with ...