In a planar coordinate system, three coordinates that locate a point by its distance from an origin (0,0,0) where three orthogonal axes cross. Usually, the x-coordinate is measured along the east–west axis, the y-coordinate is measured along the north–south axis, and the z-coordinate measures height ...

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16 views

Layer XYZ - Google API to OpenLayers

I am trying to load some tiles I generated in mercator projections. With the Google API it works perfectly with this script: <script> var map, overlay; function initialize() { var ...
5
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1answer
156 views

Why aren't there LiDAR records in some black and white parts of the scene?

This is the actual scene: This is the corresponding LiDAR scene: The LiDAR data is from xyz file. The questions are: Why are there no points for the dark squares on the checkerboard as well ...
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30 views

How to offset XYZ tile layer in OpenLayers 3?

I have an OSM layer and a layer with own tiles of the type "ol.layer.Tile" with "ol.source.XYZ" source. Both using 256x256 px tiles. Unfortunately, the areas in both layers are not congruent (i.e. ...
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2answers
57 views

Merging XYZ's in ArcGIS Desktop?

I have like 6 .xyz files that are to be included in a single map (they sort of overlap). However, I'd like to save time and automatically merge them together through python code into one .XYZ before ...
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26 views

Assign Z value to new coordinates based on interpolated response surface in R

I've created a response surface of sorts based on interpolated z values (bottom of post). I'm looking for the most efficient way to assign the respective z value to a new point (actually, a dataset ...
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1answer
156 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
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1answer
52 views

How to change sign of z value in a large dataset?

I have data in an XYZ format (saved as a .txt file) that I am importing into ArcGIS and then converting to a raster using the point to raster conversion. However the Z field in the data represents a ...
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1answer
63 views

How to convert ASCII file to TIN where XY is YX in ArcGIS?

I have some ASCII files (you can download it from: http://analizasan.kvprojekty.pl/underwork/gisse/M3451Ca1.zip) that I would like to create TIN. First I used "ASCII3DToFeatureClass" tool to create ...
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0answers
83 views

How to calculate the average point spacing for a layer of points in QGIS?

I have a set of points and want to calculate the average point spacing for further analysis. ArcMap has the 3D Analyst Point File Information for this but I'm searching for an alternative in QGIS. ...
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0answers
30 views

Regarding processing of GNSS data heights

I have a TRIMBLE GPS receiver and in its data, I am able to derive the ECEF xyz coordinates. My objective is to obtain the orthometric heights, which I could do using the equation h = H + N. My ...
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69 views

SQL XYZ tile server for OpenLayers

I am looking for some guidance to build a SQL XYZ tile server. I have a good understanding SQL Server and some experience with PostGIS. I currently generate the XYZ tiles from large raster images and ...
1
vote
1answer
151 views

Convert .xyz to contours?

Can anyone help me convert .xyz file to a contours? I have recieved some .xyz files from the local council and am hoping to turn them into a terrain for 3d modelling. I have tried the ASCII to feature ...
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2answers
708 views

Renaming filenames to a standard filename format using Python

I am working within an ESRI ArcGIS environment. I have a folder full of .xyz files that are named to a specific old file format such as 2014516_MS_005.xyz I want to be able to loop through the whole ...
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0answers
275 views

OL3: Is there a getUrl function for ol.source.XYZ?

Problem: I am designing an ol3 plugin that needs to copy the URL parameter from ol.source.XYZ/ol.source.TileWMS to ol.layer.Tile on map initialization. TileWMS: As per the docs, this is easily done ...
3
votes
1answer
96 views

CartoDB basemaps -how to clear out?

In CartoDB, when I switch to Map View on any of my tables, I have the opportunity to change the basemap, including using "Yours". In my attempts to connect to our MassGIS XYZ basemaps, I've filled up ...
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votes
1answer
192 views

Creating tiles for OpenLayers.Layer.XYZ

I am trying to use a 200GB ortophoto tif file in a web application using OpenLayers library. As I don't have no software to create WMS WMTS etc. I want to use OpenLayers.Layer.XYZ. How can I create ...
4
votes
2answers
358 views

How to create a raster tiff (dem / heightmap) from a mesh of xyz points?

I have to create a terrain heightmap(raster tif preferably) from mesh of xyz ungridded points(in geographical coordinates), I tried taking min and max of bbox of mesh and making width & height by ...
4
votes
3answers
187 views

Which raster resolution (DEM) can I get out of lidar data with variable grid width?

I have ASCII files in *.xyz format and want to generate a DEM out of it. According to the information about the data the *.xyz files are containing variable grid widths - from 1 meter to 4 meter. ...
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2answers
2k views

Equations to convert from global cartesian coordinates to geographic coordinates

First, I needed to convert geographic coordinates (like those received from GPS) to global cartesian coordinates. I found an earlier question (How do I calculate a xyz-position of a gps-position ...
2
votes
1answer
139 views

How to convert different lidar data formats to raster DTM and measure its geographic position accuracy?

I'm trying to generate a DTM from lidar data and I'm new in the this field. I have different kind of files which describe the same area (different versions): *.dtm *.xyz *.xyz with variable grid ...
2
votes
0answers
90 views

Changing grid orientation of a raster

I'm trying to load some XYZ data into a program called OpendTect. However, the orientation of the existing data is different from the grid orientation of the XYZ file. this makes it imposible to load ...
3
votes
1answer
481 views

How to transform XYZ Raster from WGS84 to UTM ED50 Zone 34

i'm trying to convert an XYZ file from WGS84 (lat/long) to UTM ED50 zone 34. Qgis can load the file as a raster, but i cant see a way of changing the coordinate system or exporting the results as an ...
2
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0answers
94 views

How can I store height info from GPS in QGIS?

I want to use QGIS as a tool for collecting GPS-Data in the field. One use case would be simple surevy tasks where I want to store the three dimensional position of points. QGIS is working fine on the ...
1
vote
2answers
369 views

How to view locally generated XYZ map tiles?

Is there an easy way to test (view on a map) my locally generated XYZ map tiles? I've used OpenLayers and Leaflet to display non-local XYZ map tiles, and I could conceivably push these tiles to a ...
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1answer
1k views

QGIS 2.2: GDAL Grid (Interpolation) Error

As much as i understand Raster -> Analysis -> Raster (Interpolation) can provide me with a terrain file out of a shape file with a Z coordinate. I select the input and output file and a Z field. It ...
2
votes
1answer
125 views

Averaging XY points locations if in close proximity automatically over a large dataset in R

I have a point dataset (XYZ values) containing a few million points covering a 5km x 5km extent representing maxima locations. However there a great deal of these points which exist in 0.5m of others. ...
1
vote
2answers
180 views

Grass GIS 6.4.3, How to create a .PTS file

I'm trying to export a raster map in order to use it in the Flo-2d program. This program needs a .pts DTM file, do you know how I can create it? Alternatively, I can use a XYZ file looking like this ...
3
votes
1answer
3k views

How do you import simple xyz in QGIS

I have found out how to get tab-delimited X,Y data into a layer but the Z field value is not given as an option on import? I tried to edit the attributes to add and define a new field but it keeps ...
0
votes
1answer
215 views

Calculate attribute height of point data

I have an x (easting), y (northing) and z (height) values associated with my point shapefile. I would like to calculate the z values from the DTM I have - how do I do this in QGIS? I am fairly new ...
2
votes
1answer
345 views

Why is field calculator returning NULL for $x and $y in line and polygon layers?

I am trying to include XY coordinates in the attribute tables of several of my vector files; they are line and polygon files. I have tried two methods; first I used $x and $y in the field calculator ...
2
votes
1answer
867 views

Create a 3D surface from xyz csv using GRASS

Apologies if this is a repeat question guys. I am trying to create a 3D bathymetry surface from xyz data. There is approximately 300,000 points with lat, long and z (depth data). The data is sonar ...
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0answers
289 views

Map with custom tiles having uncommon EPSG

I've produced with mapnik my own tiles with EPSG:31256 on a shapefile. I've structured the tiles in a OSM-like tree: zoom/x/y.png, with zoom from 0 to 2 and, x y starting from 1: tiles ├── 0 │ ...
1
vote
2answers
5k views

importing XYZ to arcmap

My colleague has several hundred xyz files (*.xyz) and wants to make a DEM to use it in ArcMap. Files have three columns witohut first lane (variable names). I suggested her: to add first line with ...
0
votes
2answers
5k views

convert geotiff to simple xyz elevation file?

I have looked everywhere and can not find a tool to convert a geotiff file to a simple ascii elevation file... did I miss something? thanks for any pointers!
1
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0answers
342 views

Print XYZ layer with MapFish Print plugin

I have a XYZ layer(i hope i call it right) in GeoExt/gxp application: ,{source: "ol",group: "background",fixed: true,type: "OpenLayers.Layer.XYZ",args: ...
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votes
1answer
517 views

Converting Easting, Northing, and Elevation to Station and Elevation

How can I convert x,y,z (easting, northing and elevation) data into station and elevation? I am trying to input the data into HEC-RAS, which only takes station and elevation.
1
vote
2answers
1k views

What software is available on OSX for working with DEMs?

I have several adjacent DEM files and would like to combine them into a mosaic and then export to DEM and TXT. I know a Windows solution is to use MICRODEM but before installing Windows 7 I would like ...
4
votes
2answers
358 views

Huge x,y,z dataset into oracle, possible?

I have 200 .xyz files containing 1500000 points each. Is this possible to import this dataset to oracle? It makes a total of 300.000.000 points!!! Background is I want to improve a FME script that ...
5
votes
3answers
934 views

Finding outliers with wrong Z values in LIDAR data

I have more than 2000 XYZ (only ground points) .txt files and I have to do Quality Control (QC). Let's say I have file, which I converted to multipoint (or even singlepart feature). I have mean Z ...
5
votes
2answers
507 views

Symbolizing xyz data

I have hydrographic data in the form of an xyz file. I would like to display it in ArcMap. I need to symbolize the points based on their depth, shallow points one colour and deep points another. With ...
6
votes
3answers
4k views

What is XYZ format in QGIS?

Basic question, but I have been asked to export data to an XYZ format. Is this the same as CSV files. I am using QGIS 1.8.0. So i am presuming i select the data I want to export, right click its ...