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

learn more… | top users | synonyms (1)

0
votes
0answers
7 views

Raster Points to Shapefile

So! I would like to be able to do this in QGIS, but if ArcMap would be better, feel free to say so. I have raster data for % Ice coverage of the Great Lakes. Each point has its assigned percent ...
0
votes
0answers
31 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 ...
1
vote
0answers
24 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 ...
4
votes
1answer
75 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 ...
1
vote
0answers
31 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
vote
1answer
86 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 ...
0
votes
0answers
64 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 ...
1
vote
0answers
33 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 ...
0
votes
1answer
29 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
vote
1answer
46 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 ...
0
votes
0answers
47 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) ...
1
vote
0answers
19 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 ...
1
vote
1answer
24 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 ...
1
vote
0answers
43 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 ...
1
vote
0answers
8 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 ...
0
votes
1answer
37 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 ...
1
vote
0answers
33 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 ...
0
votes
0answers
28 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 ...
1
vote
1answer
21 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,.... ...
1
vote
1answer
54 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
31 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 ...
0
votes
0answers
23 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 ...
1
vote
0answers
35 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 ...
0
votes
0answers
21 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?
1
vote
0answers
32 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
35 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 ...
1
vote
0answers
31 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 ...
0
votes
0answers
18 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 ...
0
votes
0answers
52 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 ...
1
vote
1answer
33 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 ...
0
votes
1answer
48 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 ...
1
vote
0answers
21 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 ...
2
votes
0answers
41 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, ...
2
votes
0answers
32 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 ...
2
votes
0answers
32 views

How to remove spikes from grid in SAGA GIS?

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. ...
1
vote
0answers
21 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.
1
vote
0answers
44 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 ...
5
votes
1answer
102 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 ...
3
votes
0answers
22 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 ...
3
votes
0answers
69 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 ...
1
vote
2answers
54 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 ...
2
votes
2answers
87 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 ...
1
vote
1answer
47 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. ...
0
votes
0answers
51 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 ...
0
votes
1answer
113 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 ...
0
votes
0answers
49 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 ...
1
vote
0answers
109 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 ...
0
votes
0answers
53 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 ...
0
votes
0answers
31 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 ...
2
votes
1answer
76 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 ...