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.
2
votes
1answer
57 views
What is the formula to convert WGS84 coordinates to EPSG 2163?
I'm looking for the formula which converts wgs84 coordinates to epsg 2163. I know that QGIS can do the calculations but I need the exact formula.
Cheers!
0
votes
1answer
29 views
Drawing on jpg-map image with proj4 (perl)
From the point of view GIS professionals this question will be sure very primitive, but please keep in mind - i'm totally newbie in this area - and this is my 1st question here.
Have several GPS ...
1
vote
1answer
25 views
If I've given two different layers the same CRS, why won't they overlay one another?
I have a "towns" and "state" shapefile for Massachusetts as two separate vector layers in QGIS. I've set the project coordinate system to WGS 84 at the bottom of the screen (next to the "coordinate" ...
17
votes
3answers
693 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 ...
-1
votes
0answers
27 views
Question on Geodesy [duplicate]
How important is it to understand geodesy when dealing with GIS? Also does anyone have recommendations on learning more about geodesy?
2
votes
1answer
84 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 ...
2
votes
1answer
62 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):
...
1
vote
1answer
27 views
generate random world point geometries
I have a world map. I need random point geometry. So, how can I randomly generate point coordinates? Any programming language. Also, I am using SRID 4326.
Any programming language.
1
vote
0answers
129 views
convert GPS to XY coordinates
if i have obtain GPS coordinates as Latitude/Longitude, then i need to convert them to XY coordinates, i see this link
actually i need to get the Trilateration , in its equation i need the XY ...
1
vote
3answers
68 views
Openlayers vector feature coordinates are not transforming,
I have a OpenLayers vector with a single feature [0]. It's coordinates are in the map projection (EPSG:3413) and I want them in WGS84 (EPSG:4326) decimal degrees. I have the following code which ...
2
votes
1answer
61 views
Calculate View Angle
I am looking for the most accurate way of calculating the view angle (Azimuth, Elevation) from a reference point (my location) A to another point B. I have the Lat, Lon, and Altitude for each point.
...
1
vote
1answer
46 views
Polygon Nodes do not have separate coordinates [duplicate]
I'm attempting to measure the distance of a series of points from a smaller number of polygons. As a first step, I've changed the polygons into points along their border, via the
Vector> Geometry ...
0
votes
1answer
124 views
convert GPS to x,y using reference node
i am using sensor nodes and their antenna to calculate GPS coordinates as notation of (degrees/minutes/seconds), i have some question of how to do these things:
how can i convert latitude and ...
2
votes
1answer
70 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 ...
0
votes
2answers
56 views
clipping polygons (vector) map with a polygon (vector) layer
A frustrated newbie with QGIS Lisboa version in Windows 7. I want to clip a soil map (multiple polygon vectors) with a single polygon (rectangular polygon vector). The project projection is set at ...
0
votes
0answers
72 views
How to calculate new coordinates by given distance, angle and altitude
I'm using C function to calculate new coordinates by given distance and angle to download google static maps tile by tile to create small map at given zoom. I have troubles because this code works ...
3
votes
1answer
69 views
How to convert these mapping coordinates
I have an older database at work and I've been asked to map the
recorded GPS coordinates for each record. Unfortunately, I can't
figure out the map coordinates that were recorded.
As an example, ...
0
votes
1answer
200 views
Make POINT from longitude/latitude coordinates from existing table in PostGIS
I would like to make a POINT using the longitude and latitude columns of an existing table. Here's a link to the documentation of ST_MakePoint.
Here's my table:
CREATE TABLE sysinst.bio (
oid ...
2
votes
2answers
181 views
Is there a way to populate a spreadsheet of city names with their latitudes and longitudes from Google Maps or some other service?
I have a long list of cities in the United States, and would like to get the coordinates for each city without looking up each one individually. Is there a way to do this?
7
votes
2answers
148 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 ...
1
vote
1answer
65 views
ROAD COORDINATES Data (CARDIFF)
Does anyone know how to get road coordinates data from openstreetmaps?
I know its possible I just don't know how.
Thank you!!
2
votes
2answers
161 views
Extract coordinates from vector layer in PyQgis
In Qgis, I have made a polygon, and from that polygon I have made a vector grid via research tools-> vector grid. The grid covers the entire polygon.
Now I want to extract these grid points in the ...
0
votes
0answers
52 views
Can't select Coordinate Display in Status Bar units decimal degrees
Using ArcMap 10.1. I suddenly can't show deci-degrees for the Coordinate Display. Instead it shows deg-min-sec. The "Use these units..." box under ArcMap Options is checked and Decimal Degrees is ...
1
vote
1answer
74 views
How to divide a certain country on a map into grids?
I want to divide a certain country into grids 1,2,3,..., which are divided equally - in other words, have the same width and length. Then, I want to know into which grid a point coordinate will fall ...
1
vote
1answer
207 views
I want to import an Excel spread sheet with desc, northing and easting into Google Earth to make a KMZ
I have a spread sheet with three columns containing a Description, a Northing and an Easting in UTM. Instead of entering the points in by hand, I want to find a faster method.
Any help is greatly ...
2
votes
1answer
68 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 ...
0
votes
1answer
75 views
How to reproject WSF layer created from GeoJSON?
I have a WFS layer:
myVecLayer_disp= new OpenLayers.Layer.Vector("Редактируемый участок",{projection: new OpenLayers.Projection("EPSG:900913")});
And i have feature store:
var protocol=new ...
2
votes
1answer
199 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 ...
6
votes
3answers
220 views
Classifying point coordinates to countries or continents?
I have about 50 000 points (latitude and longitude), and I would like to find out in which country each of the points is located. It does not need to be super precise, though.
(Or actually I only ...
2
votes
0answers
55 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 ...
0
votes
1answer
146 views
Wrong coordinates in data when projecting in world map (qgis) [duplicate]
Possible Duplicate:
How to find the proper coordinate reference system with two sets of data using different measurements or too convert one system into another
I'm fairly new to the GIS ...
2
votes
1answer
157 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 ...
6
votes
1answer
132 views
Coordinate system in aerial imagery
I am calculating WGS84 coordinates of points in an aerial image, given the WGS84 coordinates of the center of the image and the ground distance width and height (calculated from altitude and lens ...
3
votes
1answer
141 views
Getting coordinates of pixels
I want to compute an area of certain object on a picture using Monte Carlo method. The picture shows some shape on white background. To do so I figured out that I'd get the coordinates of non-white ...
3
votes
1answer
99 views
How to determine error radius of given points
I am running QGIS 1.8.0 on a 64-bit Windows 7 platform.
Given multiple points with different (but close) coordinates, how do I automatically create a new point that programmatically takes into ...
3
votes
1answer
101 views
How to fix incorrect coordinate data for the mouse's position
I am running Quantum GIS 1.8.0 on a 64-bit Windows platform. I've imported a data set that plots correctly when overlaid with a Google Satellite map, so I know that the layer/project CRS is okay ...
2
votes
4answers
184 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 ...
1
vote
4answers
305 views
Query Postgis Table with PHP
Would you be so kind as to help me with the following in OpenLayers. I need to be able to use the coordinates from a user click in a postgis query. To catch the coordinates of a click I built a click ...
3
votes
0answers
149 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. ...
0
votes
0answers
99 views
Get the continent given the latitude and longitude [closed]
I want to have certain code such that given the latitude and longitude as input, I want to get the continent which it belongs to? I know I can manually read the coordinates and then see that from the ...
3
votes
2answers
2k 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 ...
5
votes
1answer
118 views
How do you fix Overlapping Lines?
I have a line dataset that contains some lines where the "end points" are actually found in the middle of the line. In the image below, the nodes are shown in green and one of the end points in red. ...
3
votes
1answer
79 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
143 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?
3
votes
2answers
247 views
How to transform coordinates to location in x-y grid in R?
I have a polygon with a 40m diameter and several points that lay inside it. Now I want to reformat the point locations (projected in DHDN/GK-3, but could vary) to x-y coordinates ranging from zero to ...
6
votes
4answers
364 views
How to use Z-Coordinate in QGIS?
I was mapping an area in Namibia and also tracked a lot of paths on my way with my Garmin device... so I thought it would be nice to see height differences in my area (esp. interesting in the ...
0
votes
0answers
17 views
Why isn't there a 'Print Text Option' on the Answers Pages? [closed]
Why isn't there a 'Print Text Option' on the Answers Pages???
I can't remember all the different options and suggestions without printing them out.
It would be "NICE" to be able to have a ...
3
votes
3answers
984 views
How to get coordinates from geometry in PostGIS?
This line: SELECT geom FROM myLayer.geom
will return a hex value, i'm wondering how would it be possible to get decimal values, a result that look likes human-readable coordination?
Regards,
1
vote
1answer
123 views
Calulate distance between two points [closed]
If I have two coordinate points of (lat, lon), how would I calculate the distance between the two?
3
votes
3answers
157 views
I have a list of coordinates that make up a route - how can I easily render this shape on a map?
Additional info - I don't need this to be on a map - I just need the shape of the route. Is there anything that can return that shape easily?
The list of coordinates are in an xml document and I'd ...
