Geographic Information Systems

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50 views

Clipping DEM model in QGIS?

I have created a model that takes a point layer that contains elevation data, then interpolate it using TIN and then clip the results according to shapefile. The problem is that the model works and ...
0
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1answer
32 views

What are the formulas used in SAGA Ordinary Kriging?

can some one name the formulas avaible in the Ordinary Kriging Modul of SAGA: What ist the exponential, spherical, Gaussian-Model, etc.?
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0answers
27 views

ArcMap tool for for mapping and measuring methane, considering variable parameters

I have data on 70 methane-emitting plants. For each plant I have the average data of temperature and precipitation between the years 2000-2014. In addition, each plant also has relative humidity, wind ...
1
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1answer
23 views

Understanding GTFS static data relationships?

I'm trying to build a data store for the GFTS static data, but can't get my head around the relationships between Route, Stop, Stop_Times and Trips. e.g Route 2E runs between airport and city centre. ...
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0answers
50 views

Loading collada into 3D view of QGIS using Qgis2ThreeJs Plugin?

I have been looking at documentation and other posts but cannot find a way to load a 3D model into QGIS. I Installed the qgis2ThreeJs Plugin. I have tried to load a collada file in a temporary ...
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0answers
26 views

Python Toolbox: Segmenting a process. Tool as an input of a Python Toolbox

I often run processes so big that take several days. I want to segment the process so instead of running a big input through the ModelBuilder I run smaller pieces of the same input and then, at the ...
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0answers
18 views

How long should a spatial mixed model with spaMM take?

I have a dataset that's about 5k lines long, with a binomial response variable, five continuous fixed effects, and one random effect with seven levels. I initially ran a model with glmer{lme4}: glmer....
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41 views

Real-World Modelling Applications for ECI/ECF?

What are a few real-world examples for ECF and ECI (with more focus on an ECI example). I have read several articles and it only presents these concepts through physics and trig, lacking real-world ...
2
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0answers
30 views

Is there an existing solution for pattern recognition?

I've been looking at modeling potential avalanche hazard based on terrain characteristics. I have a vector layer showing historical avalanche paths and have raster layers for elevation, aspect, slope,...
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0answers
23 views

ArcGIS Modelbuilder model clogs up memory?

I have a model in which a zonal histogram is computed of each line in a feature class, showing the amount of cells each line intersects in a raster file. After this, this column is joined to a table ...
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0answers
16 views

Model not adding data to table of contents using ArcGIS ModelBuilder? [duplicate]

I have create a model that has worked for months without any issue but not when I run it, it no longer add the data to table of contents (list by drawing order/list by source/list by visibility). The ...
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1answer
69 views

Run CAR model (CARBayes package) with zip (a zero-inflated Poisson) family in R

I am trying to run the function "S.CARBym" using a zero-inflated Poisson (zip) family because my data y (cases of a disease) has too many zeros. I couldn't run it because the function asks to specify ...
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0answers
135 views

Is there a QGIS 3 Implementation of Gravity/Huff model?

I tried to implement Jake's answer, but it depends on a plugin(rasterlang) that didn't port to QGIS 3. Is there QGIS 3 Implementation of this Huff model implemention? or Is there something ...
4
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1answer
54 views

Seeking algorithms for DEM generation? [closed]

What are the different algorithms employed for the generation of a Digital elevation model from images captured using an unmanned aerial vehicle ?
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1answer
68 views

How to Create SCS (now NRCS) Curve Number Grid using GIS with European map (ESDAC dataset)?

After finishing the watershed delineation, and after creating the HMS schematic in Arcmap, i was trying to include the land use map and soil map in the process, by using the CNgrid preparation by ...
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0answers
52 views

Model builder generating empty output

In the model below, I get an empty output if I run it from start to finish. It works though if I first individually run the project and create fishnet tools, then run the entire model. Something is ...
1
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1answer
34 views

Disaggregating NetCDF in ArcMap?

I have many netcdf files in one folder. I want to extract variables from each netcdf file and save them as another .nc file. The process is like this: Make NetCDF Raster layer (one .nc) Define name, ...
1
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1answer
49 views

Problem with number entry QGIS modeler

i created some number entry in QGIS modeler I created them specifically for them to be decimal numbers and not integer. But when i try my model, when i put a decimal number like 0.255 the value ...
6
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1answer
293 views

Accessing “Save Vector Layer As” algorithm in QGIS Processing Model?

I'm building a Processing Model in QGIS that ultimately exports a points shapefile (vector layer) as a CSV in a different coordinate system than the shapefile. I ordinarily accomplish this in the "...
1
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1answer
380 views

Creating a 3D model of a pond using GPS coordinates and associated depth measurements

There is a pond which I am trying to create a 3D model of to view the depth. We have measured the depth every few meters along straight line transects all across the pond, and have GPS coordinates for ...
2
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0answers
103 views

Running Leroux model in WinBUGs

This may be a long shot, but I have been given some WinBUGs code to run a model with a Leroux prior. I'm interested in 'fixing' the precisions for Leroux prior and the intercept term in this model. ...
5
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1answer
108 views

Ignoring multi-collinearity in spatial stepwise regression modeling?

We have used multi-linear regression (stepwise) approach to perform spatial modeling with parameters derived from Remote Sensing data. The outcome of the statistically significant components produce ...
0
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2answers
1k views

How to create 2D or 3D cross sections from geological borehole data in QGIS

Is it possible to load borehole csv data that contains x, y, z coordinates into QGIS and create cross sections of the strata? It is data along a rail line so a DEM is not suitable. Just a 2D cross ...
3
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1answer
739 views

Using AddJoin in ArcPy?

I'm trying to join 8000+ daily rain tables to one climatic stations shape. The goal is to get 8000+ daily rain point features. I used to work with the next arcgis model, but now i'm trying to put it ...
4
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1answer
61 views

Modifying number of features in Merge tool each simulation run of ModelBuilder?

I am relatively new to ModelBuilder and null in python. I want to include Merge tool in my model. However: at run 1, I want to Merge shapefiles s1 and s2 at run 2, I want to Merge shapefiles s1, s2 ...
5
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1answer
1k views

Importing COLLADA Models into QGIS

QGIS 2.18.5 I'm using Qgis2threejs to put this COLLADA model ontop of a point (open in IE, not chrome). You see how the web-preview animates perfectly and the blades are centred on the hub. When ...
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0answers
72 views

ISA Model and GFS data

I have a newbie question... I always used the International Standard Atmosphere model whenever I needed to calculate the temperature in a given altitude. It always looked accurate to me... However,...
4
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1answer
2k views

DTM extraction of tree heights

I need to classify tree heights in a DSM of a slope-y terrain. It´s not a forest but several individual / detached trees. In a plane terrain it won´t be an issue but in that uneven terrain I need ...
2
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0answers
154 views

Using QGIS and Python to develop sound attenuation model? [closed]

I am in the process of developing a model that allows me to see sound attenuation over distance from a point source. I am using this sound attenuation equation: Lp = Lw - 20logr - 11 - Aabs - Ae ...
1
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0answers
78 views

Exporting Multiple Variable Inputs to CAD in ModelBuilder?

I am trying to create a tool that clips (X) layers from an area, and creates a CAD file with the layers. I'm using inline substitutions to fill in the names for the layers, (X), which are then ...
3
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1answer
260 views

Summary Statistics after Spatial Joining in Modelbuilder

I am currently building a model to help speed up part of the generation of a map I make occasionally for the Dept of Public Works I work with. I have the majority of the map already made and saved in ...
1
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0answers
16 views

Automatic add/load raster layer within selected polygon [closed]

Is it possible to automatic load/add georeferenced raster by selecting a polygon in a grid or by making a selection in a map. Perhaps it is possible to make at tool with modelbuilding?
0
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1answer
209 views

How to have a Raster output of a ppm model in spastat

I am trying to compare the outputs of species distribution models. My current code uses the following function to calculate TSS scores. TSS_Score<-function(TrueBinary, Raster) { Raster[]<-...
2
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2answers
105 views

Split lines by zones

I have a Roads line feature class and a Zones polygon feature class. I want to make a model that splits the Roads lines using the Zones polygons. The output is to be lines, just like the original, and ...
0
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1answer
420 views

Output name with Current Date

My goal is to create a daily automated task using a model built from ArcGIS ModelBuilder, then exported to Python script. I would like the outputs of this model to have the name (Stat_) + today's date:...
2
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0answers
23 views

Tools for accumulating pixel values [duplicate]

Some months ago I was asking for ideas in order to do a displacement model of a lost person with GIS. This model would represent the displacement of a person by a terrain with some costs paramethers ...
0
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1answer
377 views

Running models in python script from a list

For a while now we're running a script each night via task scheduler from which several custom models are being run. In an effort to streamline the code and simplify adding more models in the future I'...
1
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1answer
620 views

Path to toolbox in arcpy

I have got a toolbox full of models to run from one script. Is there any code that calculates the location of script from which I can get the path to my toolbox? Script and models are imported if ...
1
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0answers
135 views

Using ArcGIS Area Solar Radiation tool?

I tried using the tool multiple times and my result values should be around 2000-3000 W/m2/d. However my results reach up to 6000 W/m2/d. I am using a raster with cell size 30 meters and WGS 1984 ...
0
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2answers
208 views

How to monitor changes in a PostGIS database in GeoDjango?

I have been working on a GeoDjango project which uses a PostGIS database.I have enabled the history in my application using the django-simple-history module and works all fine. The issues comes in ...
1
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4answers
134 views

Run a model in arcpy

I have been looking at ways to run a ArcGIS model directly in arcpy, without having to export it and correct all sorts of things in the code. But somehow I can't seem to make it work. This is how I ...
1
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0answers
31 views

Using 'Index-type' raster layers with negative values as independent variables in a multiple linear model in R

Using a multiple linear model I am trying to quantify the "effect" of abiotic landscape characteristics (slope, elevation, solar radiation, and a load of terrain indices) on vegetation greenness (NDVI)...
7
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2answers
417 views

Exploratory Spatial Regression: How to limit 60 variable candidates?

I want to perform an Ordinary Least Squares (OLS) regression (global) or even a Geographically Weighted (GWR) regression (local) to identify possible causes for specific phenomena, like crime. I ...
4
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2answers
240 views

Modelling per-segment attributes in GML LineString

This is not a software-specific question, but rather a question about how to represent some concepts in a GML LineString. It has to be GML, for policy reasons. Consider a GML LineString consisting ...
2
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0answers
130 views

Create polygon layer from point data with number attribute where polygon encloses n% of point data attribute value in QGIS [closed]

I have two sets of data, one is the CodePoint Open with the location of all of the uk postcodes, the second is from online form data from which I've extracted the postcode and telephone area code, and ...
2
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0answers
229 views

Creating a 3D model of airspace that I can interrogate to see if some other feature (like a tree) will intrude into the airspace

The goal is to create a 3D model of imaginary planes in space that I can interrogate to see where other objects in the vicinity of the model cut through any part of that plane. For example, an ...
0
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2answers
672 views

how to custom geodjango admin

Here is what I do in django: class MyModel(models.Model): pass class MyModelAdmin(admin.ModelAdmin): pass admin.site.register(MyModel, MyModelAdmin) But with geodjango I have this: ...
1
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3answers
3k views

In-line variable %Name% problem in Model Builder

Having a problem with the inline variable structure of %Name%. Attached is my model builder program. I want to be able to take the Name of the file (which is produced as a variable in the iterate ...
0
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1answer
429 views

Create New Feature Class Based off Multiple Feature Classes

I've searched previous posts to see if anyone asks a similar question, but I haven't found anything. I have a multiple feature classes, each containing multiple polygons. I have two desired outcomes: ...
1
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1answer
320 views

Making centroids for vector grid in QGIS?

I need to add polygon centroids to vector grid but I can't... I have output grid like polygon, but I can't choose layer to make centroids I need it for R studio and pollution model of city. QGIS 2,...

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