Questions tagged [coordinates]

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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proj4js with geocentric CRS

I am developing a little web app to transform coordinates between CRSs. To do that I am using proj4js, but I notice that proj4js can't work with geocentric CRSs. Is there another tool similar to ...
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159 views

Extract derived data fields from Shapefiles

I've uploaded shapefiles with professionally supplied survey data into QGIS and it all plots fine, then when I export the attributes table into Excel I see that the XYZ values are all zeros. I know ...
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514 views

How to get pixel coordinates in QGIS georeferenced output map?

using the QGIS Georeferencer GDAL plugin, I can select GCPs (ground control points) on a map (plain raster input map image in a format like PNG or TIF) in an unknown projection and boundaries, and ...
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627 views

Modify features not updating on vector layer

I have point vector layer in my application.Now I am trying to modify its coordinates. I am able to do it but its not reflecting on layer. Here is code I am using : var selectInt = new ol.interaction....
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416 views

Cartesian co-ordinate system with set 0,0 point?

This is for visualization in construction project planning: I would like to set a 0,0 point and angle relative to North for an X,Y (and possibly Z) Cartesian co-ordinate system that will then show ...
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287 views

QGIS 2.8 PrintComposer, no coordinates shown

I tested under MacOS 10.10.3 and 10.9.5 now: In the QGIS v2.8 Print Composer I don´t get coordinates shown when I want to create a map sheet and activate "Draw coordinates". I can do all settings ...
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1k 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 1-...
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163 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 ...
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861 views

How to Batch Change X, Y Coordinate Number in ArcGIS?

I have a huge number of points (100000 points). Some of these have the same x,y coordinates. For example, 50 points are same in x,y then 100 points are same in another x,y coordinates and so on. ...
2
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1answer
50 views

Get coordinates from EXIF

I wonder if it is possible to know if with the EXIF ​​data of a photo you can get the angle with respect to x or y (latitude or longitude) to position it on a map. Or given the EXIF ​​data to ...
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44 views

Getting minimum distance of points with scalable algorithm

I have a number of geographical coordinates with latitudes/longitudes: id | name | lat | lon 1 | New York | 40.730610 | 74.0060 2 | Philadelphia | 75.1652 | 39.9526 3 |...
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1answer
221 views

Transform coordinate from rotated lat/lon to normal lat/lon WGS84

I have acces to an OPeNDAP service that allows me to peek into a humongous ocean wave dataset. It takes latitude and longitude as inputs (in fact even a range of the two) - but the coordinate system ...
2
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0answers
77 views

How to find coordinates of a triangle with azimuth?

I am just starting out in GIS and it's been a long time since I took math in university. I am teaching myself through a textbook but there are a few questions I am stumped on. Essentially I have a ...
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171 views

How to get points within boundaries which overlaps the anti meridian

Within my application I have a map and I'm showing markers on the map which represent objects that I get from the database. The objects have latitude and longitude. The objects are selected only if ...
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273 views

Using OSTN15 to convert British National Grid data to KML

I'm trying to save 2D data on a layer (currently to British National Grid co-ordinates) to an accurate KML version using QGIS 2.14.19 Essen. Saving directly to KML using the WGS84 CRS doesn't give an ...
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218 views

Fill QLineEdit with coordinates by click on QGIS canvas

With a plugin I can click a button and activate a QgsMapTool, defined as: class PointTool(QgsMapTool): def __init__(self, canvas): QgsMapTool.__init__(self, canvas) self.canvas = canvas ...
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422 views

Coordinates of bounding box in Map composer

I would like to find a way to export the coordinates of the bounding box inside map composer. I know i can create labels with coordinates but I'm not able to define the lat/long of the corner of the ...
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552 views

COLLADA files and geographic coordinates

I am failing to understand something here, from the arcgis help page: "The Multipatch To COLLADA tool can be used to export multipatches to COLLADA files on disk. COLLADA is a 3D model format ...
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234 views

Automatically fill table with Geographic coordinates if shapefile is in UTM?

I have a shapefile of points in Qgis 2.18. I created the points by direct click on a map, using the digitizing tool. Now I need to fill the 2 columns "Lat" and "Long" in the attribute table with ...
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21 views

Apply planar calculations to lonlat for line intersections

I need to calculate line intersections for building footprints. Line intersections are easy in planar systems and I am aware that I normally cannot apply the same formulas for long lat. However, I ...
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637 views

Click to copy coordinates From QGIS

I have a created some point data using CRS ESPG:4326 and added Google base map from OpenLayers plugin. While adding the Google Maps imagery I have changed CRS to ESPG:3857 in project properties. ...
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61 views

Sri Lanka paper map sheet key

I have a list of river gauging station locations, with the coordinates given in a local system: L/24(5.5*8.15) O/13(3.5*0.15) P/3(0.9*2.1) M/17(13.5*1.6) Presumably these coordinates are pointing to ...
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185 views

Extract coordinates of corner cells of a shapefile in Python script (QGIS)?

I have a grid in a Lambert Conformal Conic projection (with columns: ID, value) and I want to extract the corners of each cell in the native projection of the grid with QGIS. In particular, I want the ...
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132 views

Is there any map API that allows you to pull an address range from a polygon?

I've seen a lot of answers saying you can't draw polygons and get the exact addresses of all of the places contained; thankfully, I don't need so much info. I'm looking for a way to get a vague ...
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2k views

Getting random coordinates based on country

Are there any webserveices/APIs that can take a country name and return a random coordinates (not including the sea/ocean sections) inside that country?
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616 views

Schematic Map in GIS Tools?

The Question: Is there way to leverage GIS tools to author/edit a schematic map where elements' geometries has canvas-based coordinates rather than real-world coordinates on Earth? Perhaps to ...
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0answers
90 views

Finding specific area with coordinates out of a lot of LAS data?

I would like to extract spatial data out of a great amount of LAS data. Unfortunately, there is no index or sth that could help me find which file is for what area. Also, it is not possible to ...
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669 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 ...
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211 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, ...
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156 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
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1answer
229 views

Finding point within box using MongoDB?

Suppose the point has coordinates for a search within the box: (long:-155, lat:19) If we have the box: SW - (-170, 10), NE (29,69) that everything is fine and we can find this point because it's ...
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103 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 ...
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0answers
612 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 ...
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418 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) coordinates?...
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0answers
1k 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 ...
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2k views

How to limit a specific area in order to have a topographic 3D map using MatLab?

I am using MatLab, I want to build a topographic 3D map, I am following this guide, I have been doing the steps listed on the section Draping Geoid Heights over Topography, and I do not have any ...
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0answers
764 views

Should 2D Positions and 3D Positions be considered conceptually different entities?

Let's suppose we want to model GeographicPositions, described by coordinates or coordinate tuples inside some Coordinate Reference System. Also, these would be put inside some sequence to represent ...
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460 views

Comparing two spatial datasets statistically

I'm new to this forum. I'm working on the following problem - I have two datasets. Let's call it dataset A and B. Both of them will contain a set of points like A1,LonA1,LatA1 A2,LonA2,LatA2 .. .. ...
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346 views

Interpolate current Course value of GPS using previous Course values

I have a set of GPS data with Lat, lon and Course. I need to interpolate current value of course, using previous values of Course. The formula I am using is not accurate in curves.In C language I was ...
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396 views

gdallocationinfo from C++?

I need a C++ API to convert x,y Image Coordinates in their native projection to output image pixel,line coordnates. I see the gdallocationinfo documentation, but no API for it. Where in online GDAL ...
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0answers
1k views

Mean coordinates in QGIS

I am using QGIS v 1.7.4 for MAC and I am trying to calculate mean coordinates for a set of points using ftools. To calculate my result I am going to Vector -> Analysis tools -> mean ...
2
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1answer
171 views

Max length for WKT name

Is there max length limitation on WKT name? see the bold text below: GEOGCS["GCS_Wake_Eniwetok_1960", DATUM["Wake_Eniwetok_1960", SPHEROID["Hough_1960",6378270,297]], PRIMEM["...
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41 views

Move polygon to new location (find new lat-lng coordinates)

I need to move my polygon (region of geographical area) with 4 different (O1, O2, O3 and O4) lat-lng coordinates (as shown in the figure) to another place, so that I get new values of all 4 lat-lng ...
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0answers
46 views

Limit custom tiles to certain extent in OpenLayers

I want to fit my custom tiles at a certain region. For example let's say i have custom tiles for a certain country (example: USA) and I am using OSM or anything at all. How do i make sure that my ...
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30 views

How to create group of coordinates and check if a coordinate is within the group?

I am looking for a way to relate two or more types of open data from the Valencia Open data portal. This portal offer data like a traffic jam, noise, and air pollution. All these data have coordinates ...
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1answer
42 views

Transform HTML area to GeoJSON

I have this file http://www.meteofrance.com/mf3-rpc-portlet/js/datas/zones_AVDEPT73.json where the "zone" field is put in an area HTML element (so does "shape"). I have a little script that takes the ...
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1answer
49 views

Calculating coordinates given a reference point and distance

I am using QGIS 3.6 and trying to calculate coordinates (lat&long) from a point given the distance. I have the lat&long for reference point and have the distance from the reference point. ...
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0answers
84 views

Calculating pixels coordinates from lat/lon

I'm trying to develop a WPS that would print maps to images and PDFs. I don't want to use Mapfish because of its limitations, and because of some customization I need to add to the printed maps. My ...
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0answers
34 views

Problem of reversed coordinates (XY) when importing WFS data with st_read

This question was originally posted in StackOverflow. I am trying to use French spatial data distributed using WFS. I want to use these data in a Shiny app that allows the user to update the data, ...
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0answers
20 views

Need to convert coord_dimension from 4 to 2. File contains 2D polygons

I am working with PostGIS Bundle 2.5 in PostgreSQL 11. I loaded a MultiPolygon file from a geodatbase and I need to append the geometry table to an existing geometry table. However, the coordinate ...