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

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84 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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44 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
49 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 ...
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0answers
56 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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11 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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1answer
94 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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69 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 ...
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38 views

To combine attributes of point data with different spatial reference

I have rainfall data (gridded data) for a region at 25 km and other variables (max and min temperature, solar radiation and wind speed) at 35 km in ASCII format. I converted them to point feature ...
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1answer
33 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
72 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 ...
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1answer
67 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 ...
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62 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 ...
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1answer
69 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 ...
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45 views

ArcGIS export hgt/srtm

I just resampled an hgt-file using ArcMap of ArcGIS for Desktop. Is there the possibility exporting the resampled data as hgt file again?
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61 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 ...
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1answer
43 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 ...
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43 views

Hydrological triangle (geoscience) with QGIS 2.6.1

I want to interpolate ( TIN-Interpolation) between variable points (the best within a triangle) WITHOUT producing new shapefiles (or csv data file). So what I have now is an interpolation of all ...
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21 views

How to change the angle of the gradient lines in local polynomial interpolation?

I made a map with river salinities using 5 data points. When I did the interpolation the gradients come up looking beautifully but because the river is at about a 45 degree angle to the north-facing ...
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60 views

Kriging metal concentration with irregular set of sample points

I need to perform some interpolation to map a metal concentration around a platform. The distribution of my stations is not regular (see figure below where stations are the green points labelled with ...
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1answer
48 views

Comparing 2 contour data set files

I have 2 feature class files of contour lines for an area of interest - from 2 different sources. We would like to select just one to use and I'm looking for any methods to effectively compare the ...
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1answer
109 views

Method of inputing time series data in ArcGIS

I have weather stations with its geographical location ( lat,long, ht) along with daily temperature and rainfall data in time series format. I would like to use this meteorological data to interpolate ...
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0answers
23 views

Is there a standard for determining the accuracy of a polygon interpolation technique?

I'm looking into polygon interpolation, and was curious if there are any standards for determining the accuracy of polygon interpolation techniques. I've been looking through papers and lecturers ...
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52 views

3D interpolating

Our final year project domain is soil contamination modeling. We collected soil samples at the depths of 0.3 cm ,0.5cm , 1cm , 1.5 cm in about 25 locations. We considered 8 contaminants- p h, sodium, ...
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2answers
56 views

Isolation and interpretation of vineyard multispectral data

I have 3 band multispectral raster imagery over a vineyard from which i have created a number of indices e.g. NDVI. The data is fairly high resolution (5cm/pixel) so shows a lot of along vine and ...
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1answer
56 views

How to remove spikes from grid in SAGA GIS? [duplicate]

I tried to get a grid by interpolating LAS file using Ordinary Kriging. But the product grid has many pixels which values strongly stands out from average surface - I mean one pixel sinks nad spikes. ...
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23 views

How to draw a surface with Natural Neighboring

How can I use the natural neighbouring method with JAVA API of ArcGIS? I mean that I have points and z values of these points and I want to interpolate these values on an arbitrary map.
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71 views

How to include 3D break lines in QGIS raster interpolation

I wish to add a break line to an interpolation of a set of survey points to simulate an elevated ridge in the survey area. Using QGIS 2.6 on Windows 7. I have created a polyline shapefile with a ...
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1answer
143 views

Kriging to calculate forest biomass?

I am trying to create biomass map using Kriging from ground sample point. I have about 150 and 53 point plot for dense and sparse strata. The data is not normal so I have transformed it. After ...
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28 views

Preparing data for semiovariogram analysis in ArcGIS with large sample sizes?

I am working on a statewide project to create surface water quality grids from point samples. In some instances, we have large sample sizes (n>50,000) which is problematic when creating ...
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85 views

DEM from contours

I have problem to create a DEM from contours. I know it is very simple but I can not make it work. I tried everything but nothing has happended! The shapefiles I've got are a con_lin and a con_pol ...
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2answers
82 views

How to populate an attribute table from an interpolation (grid)

I am a novice ARC10 GIS user, with a question on how to add data from a grid file to a shapefile based on an attribute and position. I have a shapefile with fish positions (x,y) and their ...
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2answers
132 views

Output raster from IDW interpolation tool is from 3.40282e+038 to -3.40282e+038 in ArcPy

I am not familiar with Python in ArcGIS, so I used ModelBuilder first to set the environment and put the tool in. The model worked right and the output raster seemed good. Then I exported the model ...
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1answer
71 views

what is the difference between topo to raster and points to raster tools in arcgis

I am working with point data, and I've found two ways to create raster data. 1 Topo to raster 2 points to raster the values of each result are different, and here are some pics for reference. ...
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82 views

Linear interpolation on raster data, save result (geoserver)

I am trying to perform a linear interpolation on a coverage layer (Source data is in EHdr Coverage format, file extension: .flt). Ultimately, I want to use the interpolated layer as input to a WPS ...
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2answers
198 views

Store GPS trace with timestamps, then interpolate location by time

I'd like to: Load a 1-second interval GPS trace (not GPX) into PostGIS Then query the table at sub-second accuracy (about 5Hz), and get PostGIS to interpolate the location by time. Is this ...
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60 views

What is the best interpolation methods to use for making yearly precipitation map?

Im currently doing a project on yearly precipitation of USA for 48 states. As I did a research many people use IDW and Kringing to make a precipitation map, but my teacher said that IDW is not going ...
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146 views

How to calculate average wind speed at a particular location (given longitude and latitude)? [closed]

I am using ArcGIS 10.2 and new to this software. My question iss I have time series wind speed data in netCDF form. I extract netCDF in raster form after that in table form. Now I need How to ...
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95 views

How to minimize output raster errors using topo to raster tool

TLDR:Is there a way to specify an angle of rotation for an interpolation output based on the angle of input lines? In our line of work, we often create straight line contours that represent a sloping ...
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39 views

What are the advantages of interpolation vs raster from point elevations?

I want to make a potentiometric surface map. I have a bunch of wells plotted. The way I learned would be to make a raster of elevation of ground surface and another of depth to water and perform ...
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1answer
89 views

Calculate Height Data From Three Known Points

What's the best way to calculate "height" (snowfall, actually) data from three surrounding locations? For this example, I'm looking to arrive at a "close enough" snowfall value at point A by ...
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1answer
47 views

Optimized interpolation method with fixed-location sample data points?

I'm trying to find an optimized spatial interpolation method that deals with fixed-location sample data points. Say if I have fixed-location sampling sites and collect data daily, and then use these ...
2
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1answer
294 views

Workflow of Processing Landsat data for landcover classification

I have downloaded Landsat-8 data to make a land-use raster. So far I've made a composite image and clipped it by my study area. As you can see, there is some slight cloud cover. I've gone ahead and ...
3
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0answers
55 views

Elevation interpolation along a (sewer) line

Here's what I want to do. I have a vector sewer line feature class that contaings a field for the high invert elevation and one for the low invert elevation. I can turn them into a raster no problem ...
3
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1answer
215 views

How to interpolate point set into value contours?

The task at hand is creating 'isobar' value contours that are interpolated from a point field of either the x/y or lat/lon type. I really have no idea where to begin mainly because this needs to be ...
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2answers
174 views

Interpolation on set of points in QGIS

Is it possible to perform Interpolation in QGIS with input as a vector layer which has a set of points collected following a specified path?
4
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0answers
87 views

Interpolating species data from sample points in a small area

I have sample data from a small site (10 acres) which shows the number of occurrences of a particular species of snail over two sampling periods (fall and spring sampling). I want to try and ...
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2answers
104 views

Interpolation with z-values taken from a related table

This is a follow-up question (organizing attribute table: multiple sets of variables per point). I am working with ArcGIS 10.1, advanced license. My aim was to build a points layer, each point being ...
3
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38 views

3D distance and topography

I have a set of points and want to find out the nearest distance to a water body (poly lines) taking into account the terrain and get a surface distance calculation. I understand that the way is to ...
5
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1answer
183 views

How to determine the optimal raster resolution when interpolating a surface from points?

I'm looking for guidance on how to determine the desired output resolution, when interpolating a surface from irregularly-spaced point samples. I have a series of boreholes taken across a city, and ...
3
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3answers
91 views

Repeating steps based on different field using ModelBuilder?

I have built a model to interpolate air pollution from 40 recording stations using IDW. The results are then exported to an average for census divisions. I need to repeat this process hundreds ...