The estimation of values at unsampled points based on known values of surrounding points.

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103 views

Geoserver render interpolated polygons

First post here on the GIS forum, ill try to do my best explaining my situation. Im looking for solutions or pointers in the right direction. So, right now I'm experimenting with Geoserver. The data ...
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1answer
158 views

What resampling method is used in gdal_merge?

I am using the gdal_merge python script to merge rasters that have slightly different, though similar, input resolutions. The documentation advertises that it can handle different resolutions, and in ...
1
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1answer
93 views

give importance weighting to sample points in an IDW-interpolation

I am trying to make an IDW-interpolation in arcgis 10.1. In my sample file i have points with the same x,y and z values. According the arcgis-resource-site, the points are considered duplicates and ...
2
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0answers
89 views

Visualize smoke dispersion by interpolating point data [closed]

During the last weeks, I am trying to develop an application within my current working project, which aims to simulate smoke dispersion of fire incidents. Software used: ArcGIS for Desktop/Server (...
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1answer
1k views

IDW in R with cross validation

I want to perform IDW interpolation using R, and more specifically, using the idw command from the gstat package. Also, I want to use the optimal number of neighbors (point locations) and distance ...
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1answer
263 views

How to use gdal.FillNodata in python?

I am trying to use gdal.FillNodata in python on a ".tif" raster. The nodata value is set to -3.402823e+38. Here is my code : import gdal from gdalconst import * ET = gdal.Open("ET_sample_reclass.tif"...
2
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1answer
2k views

Interpolation grid for scattered data having (latitude, longitude) coordinates

I've got some scattered data in the form of (latitude, longitude, someParameterValue). I'm using inverse distance weighting interpolation method to interpolate them in a rectangular grid of pixels. ...
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1answer
100 views

Changing the origin of a Geotiff and resampling

I have georeferenced data from 1 to 10M resolution in GeoTiff format. I can use gdal to resample everything to 5M, but I would like to store the data so that rather than having an origin at a decimal ...
3
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1answer
345 views

How to interpolate raster to get finer resolution?

I am working with precipitation raster layer. It happens the raster data to be in a resolution of 0.25 degrees grid. How could I interpolate those pixels to have a better resolution, say, a resolution ...
3
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1answer
117 views

Interpreting results of QGIS intepolation and Heat map from point shapefile

I have taken a step interpolation and heat map of the data point shapefile (building Centroid) with QGIS ver-2.8.1, as shown below. My question are: What is the difference of the two methods? How ...
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0answers
39 views

Coordinates interpolation for video frame synchronization

I'm taking an aerial video with gps coordinates. Here's the problem: the video is x frame at second, and the gps module gives me coordinates every second. So I've the coordinate of the first frame for ...
2
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1answer
402 views

Relationship between contour interval and spatial resolution of a generated DEM

If I have contour lines with interval say 10, 5, or 2 (etc.), and I generated a DEM from them, what is the relationship between between the contour interval and the resolution of the DEM? Irrespective ...
3
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2answers
575 views

Strange spatial interpolation results from ordinary kriging

I'm using Ordinary Kriging to interpolate a set of spatial data. I'm working on different sets which represent different days of measurement. I get good results, apart from one specific set. Will post ...
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0answers
219 views

QGIS interpolation gives same value across the grid, what am I doing wrong?

Following this question, I've tried to use interpolation in QGIS to get a sense of the topography of a map based on about 3500 track points with elevation. The elevation ranges between 213 and 353 ...
1
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0answers
32 views

Strange interpolation with natual-neighbor metod

I have base shape file and try to use different interpolation methods to get image like this: This layer is constructed using point to raster conversion. Generally, interpolation methods as idw ...
2
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0answers
48 views

Expand data set by interpolation

I have a data set that is classified into 7 landcover classes. I've been asked to expand this data set to a new boundary. My question is How can I interpolate my existing data out to meet the new ...
2
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1answer
208 views

How to interpolate line Z from sparse attribute values

I have a series of end-to-end connected 3d lines which I'd like to add elevation values for all vertices on the lines which are currently null or 0. How to accomplish this? In the following image ...
2
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1answer
86 views

Why does the use of barrier lines significantly increase idw processing time?

The IDW tool's documentation states that using barrier lines will significantly extend the processing time. It does not explain why this happen. Is anyone able to provide an insight into the inner ...
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1answer
1k views

Can we create topographical map of private land using GPS elevation data?

Is there a way to create a relatively precise topographical map of a private land using GPS elevation data? As the land is a little bit over 100,000 square meters, the available regional topographical ...
3
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2answers
233 views

Kriging values greater than the most extreme value of the input layer?

I'll admit I don't understand kriging to the fullest. Yet, I've read that the weights should add up to 1 as in IDW and Natural Neighbors. However, surrounding the biggest elevation points of my ...
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1answer
65 views

Interpolating points conditionally

I have two sets of data. One comprises all home sales in a given area, where each data 'point' is actually a polygon representing the lot that was sold. The other set comprises arrests made in the ...
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1answer
288 views

Unit of measurement from standard error prediction map

I am performing an ordinary kriging analysis and came out with the prediction standard error map. I would like to know the units of such map. Can anyone help me?
4
votes
1answer
360 views

Difference between “hard edge” and “soft edge” in Arc's Add TIN Line?

Is there a technical difference between "hard edge" and "soft edge" in Arc's Add TIN Line on the TIN Editing toolbar? In both you can specify the height of this constraint and they seem to be doing ...
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0answers
100 views

How can I use a csv file with coordinates and multiple attributes to extract interpolated values for a different set of coordinates in ArcGIS?

I have a .cvs file of 501 rows that correspond to 500 coordinate points, with each row consisting of latitude, longitude for a single location, followed by a list of about 100 weather attributes (...
2
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0answers
63 views

How do Natural Neighbor and IDW assign values to pixels?

According to ESRI's help files, NN interpolation calculates a value for a "query point", yet the output is ofcourse a raster. I understand how the value of this query point is calculated based on the ...
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2answers
348 views

Which training courses in geostatistics can you recommend?

I'm looking for excellent geostatistics courses all over the world, including online courses. In particular, I would like to learn more about the kriging method. Can anyone give me some suggestions?
2
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1answer
165 views

Interpolation code with Mapbasic

I have a drivetest data, and usually I do an interpolation using the values taken in the drive with their respective lat/long. I use natural neighbor. You can see an example attached. I am trying ...
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0answers
86 views

Calculating minimum elevation surface between two (or many) surfaces

My input files are a series of layers with data points of values (numbers/doubles), either in a 25x25 meter grid, or with data points randomly strewn. Resolution and extents do not match up between ...
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0answers
108 views

Cross validation after kriging, in ArcGIS

I performed kriging interpolation using the kriging interpolation tool in ArcToolbox, not the Geostatistical Wizard method. However, how do I determine the cross validation without using the ...
5
votes
1answer
285 views

Spatial interpolation of 30 weather stations to other areas

I have monthly (and sometimes daily) data on temperatures from about 30 Swedish weather stations in the mid-19th century that I want interpolate to the whole country. I'm using ArcGIS and Stata. For ...
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0answers
61 views

Gradient fill based on scores (similar to elevation)

I'm rather new to using GIS (QGIS, specifically). I've mapped out a cohort of around 550 patients across Long Island, New York based on their full address by using MMQGIS plugin. This data is ...
1
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1answer
348 views

Interpolation and classification of soil texture data

I am trying to interpolate soil texture data on a research area. I know how to interpolate the data by making three layers for clay, sand, and silt. What I want to know is if there is anyway to ...
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0answers
561 views

Interpolation using GDAL

I am looking for some hints here. There is a shape file with point data of rainfall sampled at a regular grid, and there is a shape file with point data of soil attributes sampled at a regular grip ...
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0answers
111 views

Calculate surface map from PostGIS

We need to create surface maps from the website. The data is stored on PostGIS (2.1) as a table of Point geometries with a field indicating a thematic value. The optimal solution would be to produce ...
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1answer
75 views

Feature Class Iterator in ModelBuilder

I am hoping to run a simple Iterator operation in ModelBuilder, but everything I attempt is not producing the right results. I have a Geodatabase with many point files in it. I want to run and ...
1
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1answer
150 views

Setting lower and upper limits to classes in kriging interpolation, ArcGIS

I am using the kriging interpolation tool. I included two dummy values within my dataset:- an upper limit and a lower limit. I ran the tool in arc map 10.1 software. However, I want to change the ...
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0answers
201 views

Spatial Interpolation/Resampling of Point Surface Data - Axes @ Different Resolutions

I have a simple set of data points in x,y,z format. This was data collected from a ground penetrating radar over a physical distance of: 45m x 25m With a resulting grid of: 90 x 100 (9000 points) ...
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0answers
65 views

Problem with QGIS raster interpolation from a point shapefile after duplicating the shapefile

Let me explain a problem I had with QGIS to see if somebody else has experience it. I created a raster from a point shapefile through the Raster-> Interpolation menu with no problems. After that, I ...
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1answer
85 views

QGIS raster from interpolation not scaled correctly

I am using the interpolation plugin in QGIS to interpolate values within a boundary. I start with two layers; 1) my points and 2) a polygon for the area of interest. Then I go to Raster>Interpolation>...
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0answers
186 views

Does interpolation create a vector or raster?

I have been reading about interpolation and am trying to understand whether interpolation results in a vector or raster. Say I have a layer of points and I am interested in creating a raster that fits ...
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0answers
13 views

Finding polygon from two arcs using CLI tools or some library

I'm trying to convert from textual representation into a set of arcs and lines. The 'input' I have is: The area is within lines joining two semicircles with a radius of 0.67 NM centred on: 641139N ...
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votes
1answer
332 views

Creating an R factor raster in RUSLE Soil Loss equation with multiple input rasters

I am attempting to obtain the rainfall erosivity "R" factor for the RUSLE Soil Loss equation using rainfall PRISM 30 year history data. I have both monthly and annual data that comes into ArcMap as ...
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0answers
123 views

Optimal distance and power exponent in IDW

I want to apply IDW interpolation for my region of interest, and through leave-one-out cross validation I want to find the optimal values for the distance parameter and the power exponent. I know that ...
1
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1answer
93 views

MODIS MOD10A2 snow product

I have extracted pixel value ( pixel value=200 for snow) from MOD10A2 snow product for my study area. Since MOD10A2 product is distributed every 8-days. i.e., 9th Jan, 17th Jan, 25th Jan,2nd Feb,.... ...
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1answer
98 views

Interpolate value at a specific point using kriging

Is it possible to interpolate the specific value at a point using the Kriging tool in the spatial analyst toolbox? If not, then, how can this be done in Arcgis? To my knowledge, Arcgis only produces ...
2
votes
1answer
388 views

Create Raster Surface from Points and Equations in ArcGIS

I want to use point data to create a raster surface which distributes the values over space, as defined by an equation, and NOT by interpolating. I have an equation to describe how the characteristic ...
1
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0answers
146 views

Interpolated raster not aligned with the vector data (QGIS)

I have loaded some tab delimited text data into QGis to interpolate the points. When I get to the interpolation (IDW) part everything breaks down. The output raster file does not align with the ...
2
votes
1answer
175 views

TIN Interpolation in QGIS creates weird lines?

I am using TIN Interpolation to interpolate point features based on their cost attribute (value is between 0 and 5000). Graduated symbology creates something like this: However when I am using TIN ...
3
votes
0answers
160 views

Interpolation of SRTM data

My situation: I need to interpolate the 3" srtm data for a game I'm developing (it's like Minecraft - voxel style). I downloaded the srtm data from viewfinderpanoramas.org. My aim is to get the height ...
2
votes
1answer
74 views

Looping for importing and interpolating a lot of LIDAR files?

I'm quite new to Grass Gis and I'm trying to make DEM (digital elevation model) for modelling flooding. I have 170 *.xyz files, which need to be scanned for extents (r.in.xyz -s input=...\filename.xyz ...