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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2
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0answers
8 views

Need advice for localized survey base point

I have a set of 4 control points used for H and V localization. There is a base point located far to the SW of the property. I did not create this myself, but took it off of an existing Pocket 3-D ...
0
votes
0answers
10 views

Storing 3D Oracle sdo_geometry objects with a 2D SRID

I'm trying to understand the implications of storing 3-dimensional sdo_geometry values in Oracle when the geometry's SRID is a 2-dimensional system. The database I'm studying uses SRID 4326 (WGS84 ...
3
votes
0answers
14 views

Hexagon binning using Google Maps

I have a bunch of geolocated points that I am looking to cluster on a google map using hexagons. These clusters will be stored in a db for quick retrieval and will be reduced to a single point and ...
3
votes
3answers
70 views

Find CRS (coordinate reference system) based on known location and coordinates?

Is there any tool or any tutorial which would help me to figure out CRS (coordinate reference system) from related information? In my particular case I know only the system is in meters, has origin ...
1
vote
0answers
19 views

Appropriate reference system for small-scale mapping of the Middle East

I want to create a thematic map of the Middle East that displays certain historic places and regions on a small-scale map (between 1:6.000.0000 and 1:12.000.000). The map has to center the boundary ...
0
votes
1answer
27 views

How to manage the CRS of Open-Layers plugin in QGIS?

I am working with OpenLayers plugin in QGIS 1.8 but I am not sure on how should I manage thc CRS. The defaul CRS for Googles/Bing layers is WGS84/Pseudo Mercator (EPGS:3857) but I am not sure on the ...
2
votes
1answer
47 views

problem transforming CRS coordinates EPSG:4269 to EPSG:3857 in python

source_srs = get_srs(shp_abs_path) source_epsg = source_srs.GetAttrValue("PROJCS|GEOGCS|AUTHORITY", 1) print source_epsg #prints 4269 target_epsg = 3857 # because these are headed to leafletjs ...
2
votes
3answers
36 views

matching coordinate systems by transforming and projecting

matching coordinate systems of all my data (transforming, projecting) My data uses the GCS_Bessel_1841 coordinate system. Would there be any inaccuracies if i would transform it to DHDN 3-Degree ...
2
votes
0answers
22 views

Mine Grid to UTM

I have been given spatial data (lidar) that was collected in mine grid feet in ASCII format. I am using arc to process but need to define a projection does anyone know how to do this or any other ...
1
vote
0answers
15 views

Reference and Beacon Stations in Vietnam

I'm not sure if this question can be asked in this forum, but here it goes. I am on my way to conduct some remote sensing research in Vietnam, which includes logging of coordinates. This should ...
0
votes
0answers
16 views

Is there a way to include code/language for offsets within the “script” at the CRS dialogue screen

I'm pretty new to QGIS and coming from being just good enough to be dangerous in Manifold GIS. I have some JPEG 2000 rasters that were exported from Manifold in UTM 18S, and then imported into QGIS, ...
2
votes
2answers
26 views

Overlaying misaligned DGN file in ArcGIS for Desktop?

I received a DGN file, I believe created in Bentley 8, and there is a bit of a misalignment problem. The dgn, when overlain on a Bing Maps aerial or NAIP image, shows up about 20 m or so off. I'm set ...
3
votes
2answers
37 views

Digital Elevation Model and Shapefile not aligned in openWind

I have a digital elevation model and a shapefile containing point features for the location of wind turbines. These two layers appear to be aligned in QGIS but when I open them in openWind, they are ...
9
votes
2answers
911 views

why do people use geometry to represent geography?

Historically I've mainly worked with simple latitude and longitude coordinates in a SQL Server. I stored them as a geography datatype in SQL Server, and rendered them on a variety of displays ...
4
votes
2answers
67 views

Is there a command line tool for converting projection in .prj and GeoTiff to EPSG codes?

Is there a command line tool to convert a shapefile projection in the .prj file into corresponding EPSG code? I know that there is website http://prj2epsg.org/search for doing this online, but I ...
0
votes
1answer
81 views

Regional Large Scale Map Projection Choice

I am currently designing a geospatial product that will be primarily used for large and intermediate scales that cover an entire state of the US or more. The UTM projection would be ideal because of ...
3
votes
0answers
30 views

Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?

When adding data from PostgreSQL in a Query Layer I get the warning "The given coordinate references are incompatible" I have added many other layers with the same properties no problems, but I have ...
0
votes
0answers
32 views

Improving accuracy of mercator meters conversion to lat/lon

My question is an extention to a previous post I had here a couple of weeks ago (converting-mercator-meters-without-utm-zone). While the answer in the previous topic got me so far, I've now come to ...
2
votes
2answers
75 views

Choosing country projections

Anyone know of a good reference (either pay or open-web) that details recommended country projections?
3
votes
2answers
62 views

Reprojection of shapefile in R and final extraction of values

I need to extract values from some raster files (stack) using a shape file. to bring both of them in the same CRS, I first transformed the shapefile using the EPSG codes. Opening it in an GIS software ...
1
vote
1answer
31 views

Adding shadedreliefarchive imagery to QGIS

I'm trying to add some relief imagery that is found at shadedreliefarchive.com Specifically, I'm trying to add the SEAsia one found here. I've tried making a custom CRS to match the details found on ...
2
votes
1answer
29 views

How to build custom CRS to export QGIS to Google Fusion Table

I want to export my layer from QGIS as a CSV to import it into google fusion tables. The problem is the qgis export for the geography column is in the wrong format for what google wants. QGIS ...
2
votes
3answers
166 views

Can I use EPSG:25832 and EPSG:32632 interchangably

up until now we have been using EPSG:25832 (UTM Zone 32N) as our standard Coordinate system. Recently however after we aquired a new project area and consequently new software, I have to display data ...
1
vote
1answer
50 views

Proj4js Problem in converting coordinates from google mercator

I am a really beginner into web-cartography, so sorry if this subject is rudimentary or basic but I truly search for a long time and I am still stick in it. So the problem is: I don't understand why ...
1
vote
2answers
31 views

Correction spatial reference

Please assist me on how to use ArcCatalog to confirm the spatial reference is correct and adjust if necessary.
1
vote
1answer
53 views

Polygon using ARCGIS API for javascript

I've polygon data as POLYGON ((1645481.0939999996 6124506.9885, 1645470.0473999996 6124473.5406, 1645475.7094 6124440.1391,1645481.0939999996 6124506.9885)) in wkid=2193 I want to project ...
7
votes
0answers
149 views

Geotransformation for polar stereographic?

I'm currently working to import CANGRID climate data (provided as Surfer Grid ascii, ".grd" files) into ArcGIS. The grid is 95 rows by 125 columns in size.Metadata provides lat/lon of origin (lower ...
2
votes
0answers
49 views

Returning distances in meters from Near (Analysis) tool of ArcGIS for Desktop?

I'm trying to write a python program that returns the distance from each point in a set to the nearest road. Specifically, I was looking for any points within 10 meters of the roads. Both sets of ...
2
votes
1answer
44 views

QGIS reference system problem

I'm working with Quantum GIS 2.4 and I would like to overlap a DTM (.asc) and a shapefile. The shapefile is a copy from the another, to make some trials, who had WGS84 as original CRS; I saved it by ...
2
votes
0answers
30 views

Project a polygon on new spatial reference using ARCGIS API for JavaScript [duplicate]

I've polygon data as POLYGON ((1645481.0939999996 6124506.9885, 1645470.0473999996 6124473.5406, 1645475.7094 6124440.1391,1645481.0939999996 6124506.9885)) in wkid=2193 I want to project ...
1
vote
3answers
63 views

Project Point using ArcGIS API for JavaScript?

I've to project geometry point Point(1657272, 6100874) with NZTM, WKID: 2193 But, point is shown near Austria, not on NewZealand maps. I've converted above coordinates to geographic, still its ...
0
votes
0answers
27 views

Setting raster resolution in meters when working in a Geographic Coordinate System

I work in WGS 84 (Geographic Coordinate System) in ArcGIS 10.1. I need to create a raster specifying its cell size in meters, and output it in WGS84. Is it a good solution (towards a less shape/area ...
2
votes
1answer
58 views

How to properly open an ASTER data?

Yesterday i downloaded an Aster L1B image from USGS's website. If i load it in QGIS, it doesn't get displayed properly(location wise). Even after i've enabled "On the fly" option, it's not reading the ...
1
vote
0answers
13 views

How to add an unknown CRS to QGIS? [duplicate]

I wonder if there is an option to add a CRS to QGIS which is not listed in the internal database of the program. I read that PostGIS allows adding a custom CRS.
3
votes
1answer
70 views

Best Practice for HTML5 Geolocation with ArcGIS for Javascript API

My organization would prefer to use its own basemaps rather than those provided by ArcGIS Online due to the accuracy of information that is represented in them. The area we service is rapidly ...
3
votes
1answer
29 views

How to define custom projection EPSG:5714 in QGIS

I have a series of raster files with the CRS EPSG:5714. I need to define this CRS in QGIS but I'm fairly new to this and have no idea how to define the proj4 CRS for this. I searched at ...
5
votes
2answers
74 views

Is there a standard for the specification of .prj files?

We use shape files for data exchange. I've looked at the .prj files: different programs produce different prj files. Is there a standard how the parameters must be specified in a prj file? AFAIK the ...
2
votes
1answer
40 views

Previous shapefiles do not show in re-opened projects

I have previously drawn a lovely shapefile in a project - all saved...good job. I open the very same project and, although the background raster maps project fine, my shapefile will not show. Zooming ...
1
vote
1answer
90 views

Converting mercator meters without UTM zone?

I've been attempting to extract track information from Humminbird (Side Imaging Sonar) binary files and have hit a stumbling block with the coordinates it provides. The values are apparently in ...
2
votes
1answer
51 views

Proper projected coordinate system for Minnesota for measuring areas

I have seen in ArcGIS many different State Plane systems for Minnesota (location coordinates in WGS84: 44,07 lat/-94,61 long) within the Projected Coordinate system group: NAD 1983 (CORS 96) ...
2
votes
1answer
25 views

Accuracy of shape area measurements when GCS shapefile is source of layer in PCS Data Frame?

I would need to deliver a result shapefile in WGS 84 (GCS: Geographic –lat/lon- coordinate system), the shapefile is originally in WGS84; but in the process of creating this result shapefile I need to ...
2
votes
1answer
88 views

Dealing with raster: creating it in projected CRS and exporting it in geographic CRS

When creating a raster from a polygon (the CRS of the polygon is a geographic coordinate system), the raster is created in the projected coordinate reference system of the data frame, which is a ...
1
vote
1answer
30 views

Are shapefile coordinates unaffected when layer exported from Data Frame with different CRS?

I would need to deliver a result shapefile in WGS 84 (GCS: Geographic –lat/lon- coordinate system), the shapefile is originally in WGS84; but in the process of creating this result shapefile I need to ...
2
votes
1answer
68 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 ...
1
vote
0answers
41 views

Vector points from csv file wrong location in QGIS

I am using QGIS 1.8 (I know old version), and uploaded a csv file with coordinates. The underlying basemap is from Google, using the Open layers plugin. This basemap uses WGS84-epsg3857, and my vector ...
0
votes
0answers
18 views

How can one use Google Maps API to mimic QGIS projection/CRS

I used QGIS to find the extents of a list of features. However, the resulting data auto-generates the CRS and changes it from WSG84 to a custom one. Is there a way to use the autogenerated CRS in ...
1
vote
1answer
19 views

Difference between source SRS and target SRS in Raster Warp function

Hello I am trying to change a raster layer projections from WGS84 to a custom Lambert layer using 'Raster' --> 'Projections' --> 'Warp' function. I have been asked for source SRS and get SRS. what is ...
0
votes
1answer
44 views

CRS of QGIS bounding boxes

I used QGIS to find the extents/bounding boxes of a list of features from census data. I used the following method: Vector - Research tools - Polygon From Layer Extent, which creates a new shapefile ...
0
votes
1answer
63 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 ...
2
votes
2answers
126 views

How to calculate area of shapefile with a merged layer

so i have 'save as''d the new project and layer with my new Custom CRS project string being '+proj=laea +lat_0=70 +lon_0=0 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs'. ...