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
25 views

What CRS to use when creating buffer all over the world in QGIS

I trying to create buffers (50km) around many points all over the world (airport locations) in QGIS. I will then overlay these buffers with a world-wide raster dataset so I can extract information ...
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0answers
24 views

How do you line up a pre-existing public domain map with csv coordinate points on QGIS?

I have been struggling with this simple problem all day. I found a Florida map with the counties on Google for GIS. I uploaded the map to QGIS with no problem. However, whenever I try to upload points ...
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0answers
23 views

Reprojection script failing after running once

This is related to Getting Error 999999 from arcpy.SpatialReference.name? @Aaron gave me a workable solution. I refactored the script afterwards and it ran once successfully. When I reran it in the ...
3
votes
3answers
52 views

How to get appropriate CRS for a position specified in lat/lon coordinates?

I have a set of city networks whose coordinates are specified in lat/lons. I wish to run an algorithm on each network that treats them as a planar graph. I'm using python and can use pyproj to project ...
1
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1answer
83 views

Getting Error 999999 from arcpy.SpatialReference.name?

I'm trying to build a set that consists of spatial reference names using .name method from the arcpy.SpatialRefernce() class. When I do this for a single prj file there is no issue, but when I try to ...
1
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0answers
30 views

6 degree of freedom helmert transformation

I'm looking to do datum conversions for points with six degrees of freedom, that is, they are described by a heading, pitch, and roll in addition to their position information. I know how to convert ...
1
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0answers
15 views

StreamingRenderer

I have a problem in my code (Java Geotools). When I draw in my carte map a LineString sometimes when I run my program an errors apears and I don't understand what does it means. Error: avr. 14, ...
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votes
3answers
61 views

Identifying coordinate system?

I'm wanting to create a data layer using some open crime data from Salt Lake City, but I can't figure out the coordinate system they are using. See the link below to view the data. (You'll have to ...
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0answers
28 views

gdaltransform returns ERROR 1: failed to load datum shift file

I'm trying to do a NAVD88 to WGS84 (G1674) conversion using gdal. I've installed gdal (on centos7) using sudo yum install gdal proj-epsg proj-nad and am trying to perform the conversion via: ...
3
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1answer
32 views

VDatum helmert transform parameters

I'm trying to use NOAA's VDatum to verify the NAVD88 -> WGS84 datum conversion in a c++ datum conversion library that I've written. The answers didn't agree, so I attempted to check a simple ITRF2008 ...
2
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1answer
42 views

csv - CRS undefined, QGIS

I wonder why some csv files when imported (with long and lat) can not set a proper CRS system and other do (CRS undefined). For example: 1) if I export my data in csv with Microsoft Excel it does not ...
2
votes
1answer
58 views

How to correct ArcMap re-projection

In ArcMap, I add a layer from ArcGIS web server projected in "Bessel 1841 Transverse Mercator". Then I add new layer as a base map from ArcGIS online web server. This is the result: Shift is ...
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1answer
81 views

How can i convert the coordinates (latitude,longitude) to X,Y using postgis

I want know how i can convert the latitude and the longitude coordinates of a rectangle in the Cartesian coordinates, so I can store them in a geometry field using postgis.
0
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1answer
78 views

Finding Wgs84 coordinate from ascii grid and calculating scale over a slippy tile map?

I am currently trying to calculate the wgs84 coordinate from an ESRI ascii grid file, which the xllCorner and yllCorner coordinates are I believe in Cartesian coordinates, here is a sample of the ...
1
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0answers
27 views

Can typical Meets and Bounds (angles and distances) drawings be accurate in QGIS?

I’ve been working with parcel boundary shape files (.shp), standard satellite imagery, and Meets and Bounds (angles and distances) site maps / legal descriptions for a few weeks. Wondering if those ...
1
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1answer
30 views

Deciphering coord. ref. in R – very basic question

I'm trying to make sense of the coord. ref. parameters for rasters in R. For example, for a given raster, crs() gives the following: +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 ...
3
votes
1answer
36 views

Do outputs (shp, dwg) inherit vertical datum from input (las) files?

I'm working in ArcMap. I pulled LiDAR data off earth explorer and created a DEM with the LiDAR data. I then created contours as a SHP file and exported to DWG (CAD). I was asked if the CAD file's ...
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0answers
28 views

how to calculate area if it is falling in two utm zones [duplicate]

I am using ArcGIS 10.1. How do I calculate an accurate area measure for a polygon, where portions of it are falling in two zones, i.e. UTM ZONE 44 & 45 (India)?
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1answer
25 views

Converted a USA Contiguous Lambert Conformal Conic vector shape to WGS 84 EPSG 4326 and dimensions changed ~20%

Needed geometric tools to draw lots of parallel lines representing flight paths for taking overlapping aerial pictures - Lambert Conformal Conic was ideal (I thought). But saving to my project's ...
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0answers
26 views

Change CRS, but the image position also changing

I have 2 overlapped image, one is an aerial photo in CRS EPSG (4326) WGS 84, and one is a satellite image, in CRS EPSG:32648 WGS 84/UTM zone 48N. I need to georeference the aerial photo compare to ...
2
votes
0answers
48 views

How to instantiate a new map with proj4leaflet projections from a Bootstrap dropdown menu

I'm currently working on a Leaflet website that will be able to display GPS-Tracks with different projections. Now I'm trying to implement a dropdown menu based on Bootstrap, where I can set different ...
2
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0answers
42 views

Calculating Area for data in WGS 84 using ArcGIS for Desktop? [duplicate]

I am using ArcGIS 10.1.1 for Desktop on my laptop. When I try to calculate the area in WGS 1984 the area is disabled. If I work in one projection, say WGS 1984, and calculate area in another ...
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2answers
56 views

Reprojecting raster from one CRS to another?

I have a .tif raster file which is based on some projected coordinate system (for example: NAD 1983 State Plane California). I would like to export this raster as a .xyz file, but also reprojecting it ...
1
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0answers
55 views

projected coordinate system and transformation

I'm a beginner with GIS and I'm currently working on ArcGIS 10.3. I have two distinct shapfiles : one within the projected coordinate system "NTF_Paris_Lambert_Sud_France" and the second one within ...
0
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1answer
26 views

Shape files are not lining up [duplicate]

I have two shapefiles, with the same projection but they can not overlay. I understand that the extent is different, but i can not figure out how to change it? Here are the tow layers properties : ...
0
votes
1answer
70 views

How to find a datasets spatial reference and apply it to another dataset?

I'm struggling to use the describe function to find the spatial reference of a given shapefile and then apply it to another shapefile which has been copied to a projected folder. I'm relatively new ...
0
votes
1answer
38 views

I want to have two raster data sets overlay

I am using ArcGIS 10.3 I have 2 raster datasets with different coordinate systems, but they are the same county (just different databases). When I add them to the same map layer they are far away ...
2
votes
2answers
102 views

How to create a QGIS map of unprojected data?

I am attempting to display data generated by Ubisense technology. The data contains non-geographic x y coordinates. I would like to load this data into a QGIS project to perform analysis. Is it ...
2
votes
1answer
25 views

Geotools produces different GEOGCS value for ESRI WKT

ArcMap creates following contents in .prj file for WGS 84. ...
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0answers
30 views

Problem with reference system

I've imported in QGIS two vectors and setted the same reference system. First is a shape file, second is a csv file. The problem is that they are in different places, but they should be one over the ...
1
vote
1answer
63 views

orthogonal projection of a point onto linestring in PostGIS

I am trying to find the orthogonal projection of a Point (in 4326 SRID) onto a LineString (in 4326). The picture shows the objective. I have tried to use ST_Distance function, but in this case the ...
0
votes
1answer
45 views

watershed delineation using ArcSWAT

I want to delineate a watershed using ArcSWAT tool. Upon uploading the DEM from disk a window pops up & says: Dataset must have a projected coordinate system. The current coordinate system is ...
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0answers
17 views

Proj4 WKT - Cartesian with origin to EPSG900913

I'm converting wgs84 to cartesian with origin using simple function in c# public static double[] LL_TO_XY(double latitude, double longitude, double originLatitude, double originLongitude) { ...
1
vote
1answer
14 views

Error using gdalwarp in EPSG:4326

I tried to change the projection of AMSR-2 in Python using: 'gdalwarp -geoloc -t_srs EPSG:4326 C:\GW1AM2_201301311114_050A_L1SGBTBR_1110110.vrt C:\test100.tif' It said there are something wrong ...
0
votes
1answer
40 views

metes and bounds from historic plans

I have an historic map from 1912 in feet and has metes and bounds displayed. I am going assume one point on the map (a lot boundary intersection) is the same as it is now and then use the metes and ...
0
votes
1answer
33 views

Do different RDMS use different SRID's to identify the coordinate system of a spatial object?

I'm looking for a reference that lists a standard SRID for a given CRS. Do RDMS's utilize a standardized SRID, such as OGC? Or is it unique to the RDMS?
1
vote
1answer
70 views

Guessing unknown projection in Malaysia

I have a database of northings and eastings of boundary markers of land parcels that are in a form that I cannot pin on any format. I would like to perform some conversions on them so that they can be ...
0
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0answers
47 views

Basemap (Matlibplot) not plotting GPS WGS84 coordinates accurately

I have a list of lat,lon coordinates from Flickr pictures taken in Sydney (see here) When I plot these points on google maps, the locations are correct. However when I use my Basemap the results are ...
2
votes
1answer
41 views

Equal area world QGIS

when I use ArcGIS I normally use CRS: Cylindrical Equal Area (World) WKID: 54034 In QGIS I cannot find the same projection. When I re-project my file in ArcGIS and open it in QGIS it says I am using ...
0
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0answers
23 views

Convert EGM96 gps elevation to WGS84 ellipsoid elevation.

I have GPS elevation data (300k points) in EGM96. These points are located on the East US coast. I realise i need to work out the difference between the EGM96 and WGS84 ellipsoid in this region to ...
0
votes
1answer
28 views

How do i identify unknown coordinates reference system for my data [duplicate]

I have several shapesfiles which perfectly overlay but the coordinates reference system is unknown. I need to overly these with other data in a different coordinate system. I tried initially to ...
0
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0answers
19 views

Can I assume that ENU Coordinate are already projected?

I have an application where I need to track a vehicle position in range of max 50km. I implemented the ENU coordinate system so my future calclutaion would become easier to impelement (e.g. generating ...
3
votes
1answer
37 views

How does the offset values of LAS files relate to their coordinate system?

I have a conundrum concerning LiDAR data, the stored point offset, and the coordinate system. I process large amounts of LAS data in TerraScan (TS), which sits on top of Microstation (MS). I receive ...
1
vote
2answers
79 views

Datum shift issue between OSGB1936 and WGS84

I have to work between OSGB1936 and WGS84 and BOTH of these data sets started out life as OSBG1936 BounaryLine data. I thought I was just at the end of a full revision of my master mapping until I ...
1
vote
1answer
42 views

Digitized GIS Data - Wrong Coordinate System, Right Location

I (correctly) georeferenced a JPEG to an existing shapefile that was in the correct coordinate system. I then proceeded to create line feature classes by manually tracing some of the features ...
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votes
1answer
65 views

Difference between CRS(Coordinate Reference System) and SRS(Spatial Reference System)

I could see that CRS and SRS are referred as different components in this question Is WGS84 itself a Coordinate Reference System? Could anyone please explain whether CRS and SRS are same or ...
1
vote
1answer
21 views

Importing USGS ned30m (NAD83) into Project (NAD83/Conus Albers, OTF on): coords still Lat/Long

I apologize for posting yet-another-gis-novice's confusion about CRSs, but I have researched the issue and am surprised by what I'm seeing. In simplest form, I open a new project set On-the-fly ...
1
vote
1answer
31 views

Conversion of Sirgas2000 projection system to wgs84

I am having a bunch of .csv files containing "x" and "y" of some locations (to be specific, Brazil and the coordinate system is SIRGAS 2000). I want to convert them into wgs84 i.e, lat/long using ...
3
votes
1answer
101 views

Converting between coordinate systems for LAS file using LASPY

I am trying to convert a .las file from WGS84 to UTM17. I have some drone imagery that was used to generate a 3d point cloud/ .las file, but it is in latitude/ longitude instead of easting/ northing. ...
5
votes
1answer
54 views

Pacific-wide Projection for distance?

I have a data set of ~3500 points located across the Pacific Ocean, and am looking to measure the distance from each point to it's nearest coastline to identify the "host" country. I had originally ...