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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2answers
926 views

Extracting lat/long from screen when using British National Grid projection in ArcGIS Desktop?

Using ArcGIS Desktop 10.0, is it possible to click anywhere on the map (projected to British National Grid), but return the coordinates in WGS84 lat long?
3
votes
2answers
2k views

How to convert 6 & 7 digit coordinates to degrees latitude & longitude

I'm a bit new to the whole GIS world, and though I am making great headway drawing polygons and such in Bing Maps, I am currently stuck. In our SQL spatial data, I came across MULTIPOLYGON data, where ...
0
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0answers
16 views

Problem using EPSG:3395

in my application I use OGC:CRS83 for the coordinatereferencesystem, but now I had to change it to EPSG:3395 when I call : mQgsCoordinate->createFromOgcWmsCrs("EPSG:3395") there is nothing in ...
0
votes
3answers
453 views

Coordinate System Google Maps API

I am making an application in java using GMaps4JSF where the person will enter the address on the map I'll take this coordinate and consult on my postgis base regions in which region this point is ...
2
votes
1answer
1k views

How to calculate grid convergence (True North to Grid North)?

I would like to know how to calculate the grid convergence angle between True North and Grid North for UTM maps. I am using ArcGIS 10.0 (ArcView licence) and have used the Calculate Grid ...
1
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1answer
36 views

Is setting raster CRS in QGIS georeferencer useless? Still have to choose the same for target SRS?

I'm trying to move out of ArcGIS into QGIS permanently for basic operations, so be patient please. Here is the problem. I'm trying to georeference a topo map in EPSG:22523 (Corrego Alegre UTM). I did ...
2
votes
1answer
39 views

After how much distance does the x,y coordinate system become noticeably distorted?

I'm working with maritime sensors that give information of moving objects it detects, in azimuth, range and elevation, and we convert it to x,y coordinates for our application to be able to process ...
4
votes
1answer
40 views

Coordinate Projection Issue in ArcGIS Pro

From an issue with buffer overlaps, there was this weird problem occurring with an intersect not matching up with the buffers in ArcGIS Pro as shown below: Upon opening the same exact buffer, with ...
0
votes
0answers
24 views

How to get a layer's projection

I'm using GeoNetwork 3.0 where users can upload their own layers from the interface to my GeoServer. GeoNetwork 3.0 uses OpenLayers3. For my application, I need to determine the crs from this layer so ...
1
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0answers
14 views

Query all Object within n kilometer Radius with Hibernate Spatial?

I use hibernate spatial attach a geolocation to a car. My card domain class looks like this: import com.vividsolutions.jts.geom.Point class Card { String name Point location } My program is ...
4
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0answers
110 views

Is there a locally consistent projection for anywhere in the world?

Is there any projection that I can use that gives me easting northing values that are locally consistent? By locally consistent I mean: For any pair of objects inside a square with 5km side; if I ...
5
votes
6answers
304 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 ...
11
votes
1answer
961 views

How to define Winkel Tripel in proj 4.8.0?

I have QGIS with proj 4.8.0 installed. I'd like to add Winkel Tripel projection which seems to be defined as +proj=wintri But that definition string does not work. Is this a bug in my proj version, ...
1
vote
1answer
25 views

Polyconic Projection for China?

I have a set of locations/points and I am trying to compute the nearest distance of these points from a Polyline. The points and the polyline lie in China and the Geographic Coordinate System is WGS ...
3
votes
1answer
52 views

What's going wrong when I reproject raster in EPSG:32115 in QGIS?

I wish to make a QGIS project with an orthoimagery layer and a vector layer of GPS points. I'm using QGIS 2.8.2, 64 bit, in Windows 7 on a Lenova t430 laptop. Raster is in EPSG: 32115 (mercator, ...
2
votes
1answer
569 views

PostGIS: ST_Transform function conversion problem

I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet: ...
0
votes
1answer
22 views

Is label offset only possible in PCS?

I'm working with ArcGis 10 and I need to show the name of the streets along the street line. I want to increase the distance of the label from the line and I saw in the Label Tab I can control this by ...
0
votes
0answers
7 views

Problem with the DSID Data Set Identification

In my s57 file, I need to set the extent of the mapcanvas, for that i use : mpMapCanvas->setExtent(mpS57->mMapplay.value(DSID)->extent()); but if I display the value of the extents xmin, ...
1
vote
1answer
36 views

How to get correct lengths when switching from GCS to PCS?

I'm working on ArcMap 10 and need to get the lenghts (in meters) of the segments composing my line feature class. GCS of the line is WGS_1984. Extent of this data should be: Left 11.236520 dd, Right ...
1
vote
1answer
165 views

Transforming x/y co-ordinates of 'custom' map to 'real' long/lat co-ordinates?

I have in front of me a 'custom' map of an area I like to visit. It's just a representation of the area, so there's no real connection between the points on the 'custom' map (a) and how they would ...
1
vote
1answer
57 views

Conversion of (lat, lon, height) from GPS to another CRS

I have latitudes, longitudes and ellipsoidal heights derived from GPS readings, referenced to the ITRF08 system with vertical datum (CGVD2013) - http://webapp.geod.nrcan.gc.ca/geod/hmod/hmod.php How ...
0
votes
0answers
29 views

Coordinate Transformation Issues

We are a GIS department using ArcDesktop and SDE 10.3. We are receiving service requests through a 3rd party web application (seeclickfix) that records the service request in WGS 84 lat/long. The ...
-1
votes
0answers
36 views

GIS masters project [closed]

am a master's student interested in doing GIS project in the line of agriculture. Kindly help me brainstorm on the above subject by suggesting some of doable research topic in GIS preferably in ...
0
votes
0answers
19 views

Difference between UTM 10U and UTM 10N? [closed]

I there a difference between UTM 10U and UTM 10N? ArcGIS has 10N, but my scan map has 10U? When I attempt to georeference, my scan gets skewed
2
votes
2answers
32 views

What CRS is the USGS Global Land Cover Characteristics Data Base?

I have trouble bringing land cover data from the USGS into a "decent" coordinate system. I obtained an .img file of the "Global Land Cover Characteristics Data Base Version 2.0" from ...
0
votes
1answer
477 views

Geoprocessing tool not executing when Map's SpatialReference is Web Mercartor

I am facing a strange issue when trying to execute GP service when my map's spatial-reference is Web Mercator. I appreciate all help. I have a JavaScript API application. Initially I only had my map ...
0
votes
0answers
20 views

GIS only shows the Latitude and does not shows Longitude in nc format file?

I've downloaded a global data-sets contained of .nc format. I tried to open it in ArcGIS model. I used the function Make NetCDF Table View to view the data, when i selected the Dimension, it only ...
1
vote
1answer
259 views

WMS projection doesn't match basemap

I have a flex viewer 3.0 map in wgs 84 (4326) (ESRI basemap) with a wms which is 4326 as well. for some reason the wms doesn't overlay correctly. it is way off. appears on the maps but it is flattened ...
3
votes
1answer
1k views

Add MicroStation dgn to ArcGIS/ArcCatalog 10.1

I'm an iOS programmer but new to using ArcGIS 10.1. I'm having a problem loading my MicroStation dgn file to ArcCatalog. I've connected the folder containing my MicroStation V8i roadway design dgn to ...
0
votes
1answer
55 views

Importing shapefiles with unknown spatial reference into feature dataset?

I was wondering if I import shapefiles with unknown spatial reference into a feature dataset, with desired coordinate system, would that work?
4
votes
2answers
302 views

geocoding addresses specifically into NAD1983 or converting X,Y into 1983 after geocoding

I'm going bananas trying to geocode addresses into a NAD1983. I have ArcMap 10.1 and I'm using the default address locator (North American 10.0 from arcgis online). No matter how low I set the ...
0
votes
1answer
43 views

Using CAD data that is not to be projected in ArcMap?

I need to incorporate CAD data into my geodatabase but the usual steps seem to require defining a projection or projecting the data in some way. All of my geodatabase's feature classes are in ...
1
vote
1answer
52 views

Extracting *.tif agricultural area from shapefile?

I am attempting to extract from an image using Esri shapefile that is in the zip file RR_KZKD2012 In ArcGis the spatial reference is Projected Coordinate System: WGS_1984_UTM_Zone_43N. Then am using ...
0
votes
1answer
29 views

How to create a customized grid with two coordinate systems?

I need to put two grids on a map - one in NAD27 State Plane CA Zone 5, and the other in NAD83 State Plane CA Zone 5 (feet) and have the grids be formatted properly. If I go into the Data Frame ...
0
votes
0answers
50 views

Feature Points Shapefile missing Spatial Reference Information

I'm working with ArcMap 10 and I have a feature points shapefile from the Florence (Italy) municipality open data (http://opendata.comune.fi.it/statistica_territorio/dataset_0040.html). Each point is ...
0
votes
2answers
34 views

Are State Plane Coordinates always derived from longitude and latitude?

Do state plane coordinates always begin as longitude and latitude? In other words, they are not another system that can be calculated without Long. and Lat., correct? I guess I'm saying, back in ...
1
vote
1answer
31 views

How to display the map within two longitude lines

I am new to GIS and I try to use the following code to display a pacific-centered world map. +proj=robin +lon_0=-198 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs However the map ...
28
votes
2answers
3k views

How accurate is approximating the Earth as a sphere?

What level of error do I encounter when approximating the earth as a sphere? Specifically, when dealing with the location of points and, for example, the great circle distances between them. Are ...
0
votes
2answers
397 views

Myanmar Datum 2000 information

Does anybody know where I can find the technical details for Burma's latest datum? It's called Myanmar Datum 2000 and I can't find any details online. I need the details to create a custom datum on my ...
2
votes
2answers
615 views

How to display distance in meters (km) and not in Decimal Degrees in QGIS 2.4?

I am a GIS beginner, and I have a question about how to get the distance between two points in meters instead of decimal degree. In QGIS 2.4 I have a project with two point layers (in WGS84). From ...
2
votes
4answers
168 views

Meter Coordinates to decimal Coordinates

I have an excel file in which I have XY coordinates, example on the attached immage that is the form XCoord | YCoord 15822.426100 | -2747650.026000 I need them in the form ...
1
vote
1answer
62 views

What projection to use for many parts of the world

I'm creating a poster which has many separate maps (rivers of the world). I'd like to use a similar projection for each of them, so they're comparable in terms of shape and size. I guess I want some ...
-3
votes
0answers
43 views

Defining Coordinate system

I am working with a bunch of shapefiles that have no coordinate system attached to them. I was wondering if there is a tool that I can define a new coordinate system for them and bring them in to GDB! ...
3
votes
1answer
48 views

Point Coordinates Conversion with unknown system

I've been using QGis for few weeks now. Although this site always came very helpful, I can't find solution to my recent problem: I have few points, and know their coordinates in "WGS-84" and "ISN-93" ...
0
votes
1answer
168 views

Determining unknown Coordinate System using QGIS?

I'm trying to figure out the coordinate system of some data I downloaded from a no-longer-maintained USDA website. The data's still accurate, it's just floating in space. I've tried several ...
0
votes
1answer
38 views

GeoTools, convert CRS for Google Maps

I'm trying to use GeoTools to convert coordinates from EPSG:3857 to various CRS, in order to display WMS layers on a Google Map. For example, I want to display a layer in the EPSG:4326 CRS. I have ...
0
votes
1answer
40 views

Postgis geometry column with different srid

I have a table that has geometry column named the_geom. I set SRID value to 29903. And I used Openlayers api to view data on map. I set map srid as 29903 and works well. But if I need to show my data ...
3
votes
1answer
74 views

Problem with distance in QGIS

I start a new project with base on OpenLayers plugin but if I check the distance on QGIS with distance tool (I choose a straight road) I view 5.466m on QGIS and 4.300m on google (by walking). How is ...
0
votes
1answer
73 views

Real-world dimensions of a 3D object in VisualSFM or MeshLab

I have a good-quality, precise 3D scene reconstructed from photographs/video by VisualSFM. All camera parameters, including 3D position and lens details, are known. Now, that the hardest work has ...
1
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0answers
29 views

How to access Leaflet EPSG:3857 coordinates?

I read everywhere that Leaflet is internally using a spherical web mercator (EPSG:3857), but whatever I try I get either Lat/Lon (EPSG:4326) or strange coordinates I dont understand: ...