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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20
votes
5answers
28k views

How do I create point features with exact coordinates?

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: -Add point, type ...
23
votes
1answer
7k views

Is WGS84 itself a Coordinate Reference System?

I was wondering the difference between WGS84 and EPSG:4326 (see this). Can then WGS84 on its own be defined as a Coordinate Reference System? Or is it just a datum so that a Coordinate System must ...
6
votes
3answers
19k views

How to get the coordinates in Lat/long from a point layer?

Sorry for asking this basic question, but I couldn't get the solution from the previous answers. I need to extract the Lat/long coordinates of the centroids of districts. My QGIS project SCR and the ...
6
votes
3answers
2k views

Adding “noise” to overlapping X,Y coordinates so no longer in EXACT same place?

I have a series of points representing animal observations. Many of them overlap, having the exact same coordinates, and this is causing me trouble when I want to run some analytical tools which ...
12
votes
3answers
7k 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.
4
votes
2answers
13k views

Calculate bearing between two decimal GPS coordinates

I'm building a virtual tour application that uses custom panoramas in conjunction with Google's StreetView service. With StreetView, you can have 1 to n links at each particular location to move to, ...
24
votes
2answers
2k views

Why do we use the terms “longitude” and “latitude” for a spherical body?

To specify a geographic coordinate we use the terms “longitude” and “latitude”. Far as I know, these terms derive from the Latin latitudo (= breadth) and longitudo (= length). In German we use the ...
13
votes
5answers
15k views

How to generate random locations nearby my location?

I am trying to create random locations nearby my location. What i want is to create random latitude/longitude pairs inside a 200 meters circle surrounding my location. This is the formula i came up ...
3
votes
3answers
810 views

Formula for coordinates (lat, lon), azimuth and distance.

I would like to know how to find a set of coordinates on a small circle some distance from another point. For example, lets say A = (39.73, -104.98) #Denver B = (39.83, -106.06) #point ...
3
votes
1answer
83 views

Help identifying a coordinate system

I have some "latitude" and "longitude" data that describes the Silverstone motor racing circuit in the UK. The coordinates look something like this: latitude longitude +03124.27986 +00061.07652 ...
3
votes
1answer
2k views

Understanding the difference between coordinates projection in OSM and Google Maps

I'm looking at the coordinate differences between Google Maps and OSM. I'm a noob in the technicality behind GIS. Having read: EPSG 3857 or 4326 for GoogleMaps, OpenStreetMap and Leaflet How to ...
1
vote
1answer
60 views

how to produce a RASTER representing X coordinates [duplicate]

In a journal article I have read that two rasters, representing X and Y coordinates respectively (see attached figure), have been entered as predictors in a GIS-based Logistic Regression for a given ...
3
votes
5answers
3k views

How to find coordinates for a lot of locations based on the town or village name?

I have got an Excel spreadsheet with roundabout 15,000 locations, which are only identified by the towns or villages name and the country. I am intending to present these on a world map. Therefore, I ...
2
votes
2answers
707 views

How do I import specific Coordinates from Namibia in QGis?

I have a map here with Coordinates from the Schwarzeck Map Datum Format 1903. They have the following format e.g.: y: 41 944,31 x:363 810,71 I want these point to be pictured in QGis... how is it ...
1
vote
1answer
714 views

Calculating distance between two sets of Decimal Degree coordinates?

I have coordinates in decimal degrees e.g: point A:Lat,Lng(5.317101667,-2.023303333) and point B:lat,lng(5.317093333,-2.023318333). The altitude in Meters at Point A is 11m and the altitude and Point ...
5
votes
2answers
16k views

Convert X,Y State Plane coordinates to decimal degrees

I have 1000's of data point I need to convert from North Central Texas 4202 into Lat/Long decimal degrees. Can someone give me a conversion equation so I can quickly convert using excel? I have only ...
4
votes
2answers
348 views

Why Different 2D Coordinate Transformation Methods Exist

It is a homework question but I couldn't find a satisfactory answer by googling. There are 4 different transformation approaches I'm asked for: - Conformal, - Affine, - 2D Projective, - 2D Polynomial ...
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
5k views

How to get Shapefile point coordinates into .xls?

How can I get just Coordinates (in a file) from point features (shapes) without big hussle. Something like Shape to .xls, with distinct coordinates? I want to use this coordinates immediately, so GPX ...
1
vote
1answer
261 views

Is it possible to link a QGis project with an excel file?

I have an Excel file with coordinates and I have used this file to plot the coordinates in QGis. I was wondering if it was possible to permanently link the excel file to the QGis project, so that when ...
0
votes
1answer
429 views

Link Google Earth with QGis

I was wondering if it was possible to link Google Earth files (KML, KMZ) to a QGIS project. The main idea would be that if you'd add a point with coordinates in Google Earth, this point would be added ...
0
votes
1answer
433 views

How to convert drawn vector feature from EPSG:900913 to EPSG:4326

My script allows you to drawn shapes on an openlayers map, and then to get the WKT information from that shape, except the returned coordinates are in 900913 and i need them to be in lat/lon. thanks
0
votes
2answers
941 views

How to find the proper coordinate reference system with two sets of data using different measurements or too convert one system into another

I have two different entries of data in two different spread sheets. One of the spread sheets uses a coordinate reference system that I have no idea what the units of measurement are. the properties ...
4
votes
9answers
15k views

Creating shape file from file with coordinates

How can I make a shape file of an csv file with coordinates?
3
votes
2answers
1k views

Looking for Python module to do lat lon calculations

I'm looking for a Python module that can provide some / all of the following services using latitude/longitude to define points: Distance between two points Point in polygon Distance along a ...
3
votes
1answer
4k views

How to manually edit point coordinates in QGIS?

Is there a tool for shapefiles or a QGIS plugin available, which will enable me to edit the coords of a point manually ? ("tool" -f1 "Tsunami Gauge"-move x1.abcdef -to x2.ghijkl) I do have ...
3
votes
1answer
2k views

Is it possible to place a point at a coordinate in QGIS?

Is it possible to place a point at a coordinate in qgis? I have a map, using irish grid reference and wish to place a point at an exact 6 digit coordinate. Is it possible to do it. Previous to this ...
2
votes
1answer
121 views

Coordinate system doesn't contain values in the range -180 to 180 and -90 to 90

I'm creating an android version of a PC program (I've contacted the company who owns the PC program, so it's legal). The program is in the core a GPS, but is used to navigate pre-defined routes for ...
0
votes
1answer
996 views

How to adjust the difference between the coordinate from OpenStreetMap and Google Maps

I have downloaded the OSM from OpenStreeMap that came with all nodes from the map and their respective coordinates. Now I have to plot a node (latitude and longitude) on Google Maps, but all ...
8
votes
2answers
1k views

How do I group near points with GPS positions?

I'm an IT person so I don't know too much about projections and so on, I hope you can help me. I have made an application for Android that collects a GPS position, so I have the latitude and the ...
4
votes
1answer
274 views

How to create cohesive Spatial Pixels from Spatial Points Dataset

I have a Spatial Point DF spo (covering an irregular shaped area of interest). The data are not on a regular grid due to crs transformation. My goal is a raster with predefined resolution and extent ...
3
votes
1answer
222 views

Enter 4 Coordinates and get a Polygon QGIS

Is it possible to enter 4 Coordinates for getting a Polygon. I have to Clip lots of exact rectangles and i was just wondering wether you know a plugin. Thanks a lot danke! Alex
2
votes
1answer
421 views

How to get the First and Last Point coordinates of a Polyline with Field Calculator in ArcGIS10

I'm trying to get the First Point coordinates (x,y) and Final Point coordinates (x2,y2) from a polyline in ArcGIS 10 with the Field calculator. I've added 4 (double) fields like StartX,StartY,EndX ...
2
votes
1answer
386 views

How do you calculate positional accuracy in qgis?

How to you compare two layers in QGIS to get the positional accuracy?
2
votes
1answer
1k views

How to unproject coordinates on a Google map with Openlayers?

Below is my code and a pic. When I finish making my circle on a Google map with Openlayers, I get the following coordinates but I want coordinates like E.G: bottom: -27.762124575762 left: ...
1
vote
3answers
1k views

How to export xy-coordinates from a line segment

I need an export of xy-coordinates of line segments (Quantum GIS). I found an answer to a similar question here but that concerned only xy of the first and last vertex of a line segment. But I need ...
6
votes
5answers
3k views

Working out the coords of a square x miles from a 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 ...
4
votes
1answer
457 views

Line vs. Polygon Intersection Coordinates

I am working with Python, Shapely and Fiona... Is there any way where I can give in an input of a line shapefile and a polygon shapefile, and get a result of the intersection points and their ...
3
votes
1answer
372 views

How to get X and Y coordinate values of the map?

I want the upper right and lower left coordinate of the exposed portion of the map, and for the whole map. What is the way to do this?
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
2answers
114 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
2answers
102 views

How to get cell value along Flow Direction

I have: a flow direction raster where I took off (assigned NoData value) the cells that overlayed the river network (from flow accumulation). a perfectly overlapping raster where I asigned a ...
2
votes
1answer
97 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
2answers
7k views

ArcGIS: Create polygon using file containing point coordinates

I have a text file containing the projected coordinates of the points that define a single polygon. The X, Y coordinates are separated by Tab Is there a tool in ArcGIS similar to "Add X,Y Data" in ...
2
votes
2answers
492 views

How likely is it that Smartphone Camera GPS coordinates are wrong?

According to the coordinates printed directly on this photo of my late son Kelvin here: https://www.dropbox.com/sc/w6tvwuvbosuh9rk/AADzT-3vDXcFQ9LnKK1BYMZUa ...and the Exif data from the .jpg: ...
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
172 views

Why does QGIS 1.8.0 crash when I try to set up CRS on Win XP?

I have a problem with my qgis 1.8.0. When I click on any button that set CRS or try to set the coordinates on the fly, qgis crash. I try to uninstall the program and re-install it again using ...
2
votes
0answers
520 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
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
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 ...