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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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 ...
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29 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. ...
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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 ...
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How to integrate info Z into a point shape, no attribute table

Firstly, I use ArcGIS-9.3 and I have a point shape, but when I try to get info about its value Z (Sketch Properties) the result is "0" for ever points, like this: X:274988,260 Y:4126481,508 Z:0 M:NaN ...
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332 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 ...
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85 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 ...
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Why is Field Calculator Returning NULL for $x and $y?

I am trying to include XY coordinates in the attribute tables of several of my vector files. I have tried two methods; first I used $x and $y in the field calculator (which I've used before and ...
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274 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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226 views

OpenLayers with Custom Map Tiles and Bounds - Bound and Rendering Issue

I am using a custom map image. And I have verified my lat, lon bounds via google maps. But when using the code below combined with my image - it sometimes returns a negative number for y based on ...
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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 │ ...
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2answers
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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: 1- to add first line ...
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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!
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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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232 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.
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2answers
402 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 ...
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2answers
220 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 ...
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3answers
380 views

Finding outliers with wrong Z values in LIDAR data

I have more than 2000 XYZ .txt files and I have to do QC: let's say I have file, which I converted to multipoint (or even singlepart feature). I have mean Z value for a file, but ... if most of the ...
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2answers
266 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 ...
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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 ...