A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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61 views

Rounding off coordinates in an SpatialPolygonDataFrame in R

EDIT AFTER COMMENTS After a comment of Whuber (Thank you!) I realized it will probably be most easy to incorporate a round(...) statement within my code to be able to work with less decimals. ...
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1answer
78 views

How to convert Geographic wgs-84 to lambert (LCC_wgs 84 projection for a vector file?

I have one shape file with Geographic wgs-84 projection but i need to calculate geometry for that I tried to convert it into UTM projection system. As my data is of whole country so I can't give one ...
9
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0answers
156 views

How do ESRI and QGIS calculate scale values of geographic projections? [closed]

Does anyone know how (from which location) scale values are calculated in ESRI products and QGIS for geographic projections? The only thing I've noticed is that QGIS is changing scales when you pan ...
2
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2answers
119 views

Geodetic lat/lon to ECEF cartesian: Direction to apply geoid undulation from ellipsoid surface?

I'm working on modeling the earths surface in 3D, using a combination of WGS84/EGM96 and NASA SRTM orthometric height data. To calculate a final cartesian XYZ coordinate for a point on the earth ...
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2answers
90 views

What kind of coordinate system has values like 48569.800mE, 706602.032mN?

I am seeing the following set of coordinates, and I was wondering what kind of system is this? 48569.800mE, 706602.032mN
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1answer
42 views

Issue with gdal getprojection and setprojection returning different information

I am using Landsat imagery from the USGS. Those who use them may know that the projection attribute is wrong (everything is in the Northern hemisphere). I have a script to process tar.gz files and ...
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1answer
28 views

postgis - managing single dataset, multiple coordinate systems

I am setting up a forest inventory database that aims to store information about forest plot data from various countries. The current project is in Mozambique, others are in Laos, etc. Each project ...
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1answer
70 views

Specifying output coordinate system in ArcPy

I'm updating somebody else's old Python scripts, and trying to make sure I understand their logic and desired outputs while streamlining the code. In this particular script, it specifies an output ...
2
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2answers
909 views

Convert Feet to Decimal Degrees

I need to convert a bunch of coordinates that were stored in Feet to Decimal Degrees. I found a Function in VB.Net, though it's results are not coming back correctly. When I input 3106972, 1417936 ...
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2answers
91 views

Projected coordinate system for South America

Does anybody have any suggestions for a projected coordinate system for the Northern part of South America? I have a data set that reaches from Venezuela to Southern Peru and I'd like to do some ...
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1answer
102 views

Identifying projection for shapefile with unknown coordinate system, no z values and no measures? [duplicate]

I am attempting to create a GIS Project with multiple Brazilian cities. I have been collecting, and am interested in, shapefiles that delineate the neighborhood boundaries of said cities. One city's ...
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1answer
54 views

Map Scale Bar Grossly Incorrect [duplicate]

I am working with open data from the City of Toronto. I am using a base layer of property boundaries which can be found here: ...
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1answer
117 views

Tiled raster image to be placed in an OSM/ Leaflet.js map

I have a mapoverlay in a custom projection which I need to add as a layer to an Openstreet map within a website. Since I was not able to change the projection earlier, I decided to manipulate the ...
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0answers
52 views

My map is little bit off

I am pretty new in GIS things and i have been learning how to use QGIS. Most of the maps are fine, but yesterday I went to GIS center at my University and I got the maps of my country that I will be ...
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1answer
31 views

Performing transformation from GHANA GRID to WGS 84 using QGIS?

I have a shapefile which was referenced using Ghana's grid system. I imported it to QGIS and specified WGS 84 but the coordinate bar still displays the Ghana grid values in the coordinate bar. Is ...
2
votes
1answer
89 views

How to assign CRS to RasterLayer in R

I have a layer with coord. ref. : NA. How can I assign coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 to coord. ref. : NA? class : RasterLayer dimensions : ...
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0answers
75 views

How to import a map consisting of pictures

I want to built some sort of Fantasy Map with Quantum GIS. The whole map is built out of 128x128 single pictures, 16384 in total. It should be a flat map. How do I import these pictures and align ...
2
votes
1answer
255 views

Changing map projection and adding graphic features in projected coordinate system using ArcGIS API for JavaScript?

I'm having some problems with the ArcGIS API for JavaScript. I have a web service that traces an electric network and sends back JSON with point and polyline (path) geometry. I've created a function ...
2
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0answers
273 views

ArcGIS WGS84 Web Mercator Vs. WGS84 UTM zone 15N: Very different distance dimensions

I am working in ArgGIS 10.1 with a field (raster layer in tif format) in which I have placed two points (.shp layer). I have two versions of both layers, resulting four layers: one tif+shp set in CRS ...
5
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1answer
82 views

What kind of coordinates are this ones?

I have to map a point using this coordinates: 38 R MF 18852 15799 I can't understand the coordinate system. For sure '38' is the UTM zone number and 'R' is the designation (indicating southern ...
2
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0answers
81 views

How to get a native srs and declared srs of layer using gsconfig?

How we can get native SRS and declared SRS of existed layer in GeoServer? I'm getting up to layer name available in a particular store and work space. The code as follows from geoserver.catalog ...
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1answer
90 views

Adding SRID 3857 to spatial_ref_sys

My application is throwing the following error: DatabaseError: GetProj4StringSPI: Cannot find SRID (3857) in spatial_ref_sys I'm guessing (as stated above) that I need to add the SRID 3857 to the ...
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2answers
443 views

Converting from different projections to WGS84 Web Mercator Auxillary Sphere

I have multiple datasets in my ArcGIS, each having different map projections. All of them are vectors. Some are using Sphere Mercator, others using WGS84. I cannot perform the reprojection function in ...
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0answers
58 views

Arcmap: transform an image from Web Mercator Projection to Simple Cylindrical (Plate Carree) projection

I have an image that is projected using the Web Mercator projection. Does anybody know how to transform (in Arcmap) this image from the Web Mercator projection to the Simple Cylindrical (Plate Carree) ...
3
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1answer
61 views

Conversion from Namibian Coordinates to Google Maps (WGS84)

I have coordinates in Namibia, but don't know how to convert them to use them in Google Maps. The system is Lo22/19°. Then Y: +55 435,89 X: -498 157,28 Can anyone help with a conversion?
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2answers
224 views

How do I convert Geo-Coordinates to Pixel-Coordinates on a Map?

I have an image file that is a Robinson Projection Map of the world. I have a list of geo-coordinates. I would like to find the pixel-coordinates on the map that correspond to my the geo-coordinates I ...
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0answers
84 views

Whats an appropriate map projection for georeferencing aerial photos?

I have some aerial photos that were shot from directly overhead a 5x5 mile property. They were then mosaiced to create a continuous overhead tiff of the entire property. I am now going to ...
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2answers
72 views

Shape length distance wrong in Robinson projection

I have a world map in the WGS 1984 Geographical Coordinate System. I want to measure the lengths of borders between countries in kilometers. To get the units in meters, I have first used the Define ...
3
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0answers
53 views

What projection system is used in China which is aligned with WGS84

I have some GPS tracks in Beijing. I want to project it and convert the lat long degree values in meters for calculation in euclidian space. I was wondering what is the most suitable coordinate and ...
1
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1answer
80 views

Shapefile not projecting correctly [duplicate]

I am still new to this, so I apologise if I don't make a lot of sense! I am using QGIS 2.4.0 Chugiak. I am working on a project set to the GDA94/MGA Zone 50 coordinate system with 'on the fly ...
3
votes
1answer
150 views

Comparing printed nautical charts to GPS coordinates

I'm just getting my head wrapped around the various geodesic systems. I have some (printed) Finnish nautical charts I'm trying to match to GPS coordinates. Given the number of underwater obstacles, ...
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0answers
81 views

How to make crs transformation of a QgsVectorLayer?

I need to transform QgsVectorLayers in python from one crs into another crs. By googling I found the following solution ...
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1answer
53 views

ArcGIS 10: How to programatically project coordinates? [closed]

Let's say I have coordinates defined for SRID 4686, is there a way to programatically transform them to SRID 4682?
2
votes
1answer
107 views

Why is this .prj file causing the shapefile to render in meters instead degrees?

So I've got a shapefile that has polygons of countries, with coordinates in decimal degrees: Country (String) = Algeria POLYGON ((6.928073999999953 36.88360652, 6.949973999999969 ...
5
votes
2answers
130 views

CRS for submission to Minnesota DOT

Does anyone have experience using QGIS to submit shape files to the Minnesota DOT (MNDOT)? I am using EPSG:26915 but got rejected due to an error in the CRS. MNDOT Specs call for "UTM coordinates, ...
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0answers
48 views

If I were flying over a flat world at constant elevation, taking aerial photos, how would I patch them into a mosaic?

Restating the question: If I were flying over a 2 dimensional world, at a constant altitude, how would I patch those images together? I'm using some tools right now that assume I'm doing a panorama ...
2
votes
1answer
152 views

How to find the projection of an image?

Instead of georeferencing the image and deforming it, I'm trying to find the projection used by the author of the image. I've got tens of these distribution maps to digitize. The idea is to avoid ...
1
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1answer
51 views

Determining projection of Texas county shapefile?

I have a Shapefile of San Jacinto County in Texas. It thinks it is NAD83 UTM Zone 15N, but the dataset isn't jiving with any other dataset. Max X: 1,073,721 Max Y: 11,223,970 Min X: 895,728 ...
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0answers
39 views

Question about projected coordinate systems 30m DEM for Contiguous US

What is the best Projected Coordinate System (PCS) for the contiguous US (whole, not parts) if I want to maintain distance and area accuracy as much as possible across a nationwide DEM dataset? I'm ...
2
votes
1answer
70 views

How to clear spatial reference identifier?

I created a table in oracle with a sde.st_geometry column. I followed the instructions of ArcGIS help to register the table into geodatabase. My table creation statement is: create table ...
2
votes
1answer
107 views

Defining projection, reprojecting, and wrong area values [duplicate]

Apologies for duplication--this was mentioned in a previous post, but was suggested that this specific problem should be posted separately. My data: http://water.usgs.gov/GIS/dsdl/aquifrp025.tar.gz ...
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2answers
32 views

Identifying my coordinates from external datasource

I'm working with data received from an agency outside of my office and two columns in the dataset are labeled 'CompX' and 'CompY'. Here is a sample set pulled from the spreadsheet: ...
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1answer
33 views

XY data --> NAD_1983_2011_California_Teale_Albers always fails?

In ArcGIS 10.2, I am importing XY (point) data from excel, and have been having trouble projecting it into the following Projected Coordinate System: NAD_1983_2011_California_Teale_Albers -- NAD ...
1
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1answer
57 views

Counting number of points in 1 km grid covering surface of Earth?

I want to cover surface of earth with equal sized shapes and count number of points within each cell. shape of cell doesn't matters (triangle, hexagon ...), neither area, but equality of them is ...
4
votes
3answers
283 views

Does the NED use geocentric or geodetic latitude?

What kind of latitude does the National Elevation Dataset (NED) use? Geocentric or geodetic or something else? I can't find the information anywhere on their site (http://ned.usgs.gov/index.html) or ...
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0answers
35 views

Calculate end point Height above the MSL of the target point given a starting point, distance, azimuth and elevation [duplicate]

We need to find the end point height (from the earth surface) given the start point lat, lon, azimuth (270 deg), distance (500 km) and elevation above the horizon of start point (10 deg). The ...
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1answer
83 views

Moving object of fixed dimension without distortion

I am trying to move a polygon object in a shapefile to a new location. I will perform an offset so that the process can be automated by shifting the object to a new geographic coordinate or moved by ...
3
votes
2answers
3k views

Converting from an x-y coordinate system to latitude/longitude

I'm building an indoor wifi-based tracking system that can calculate the position of a device in meters relative to the sensors distributed throughout the building. So far I've gotten to the point ...
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1answer
35 views

ESRI : 54019 or World winkel II in QGIS

Currently I didn't find World winkel II or ESRI : 54019 coordinate system support in qgis. One of our client using this.. Can any one tell me a solution to load shape files,which are using his ...
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3answers
63 views

How to convert crs projection of Map in qgis

I am totally new to GIS. I have a qgis project. I am adding the screenshot. As you can see the map is sort of rectangle in projection. How can i project it like this (without the grids) Thanks ...