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Geographic Information Systems

Questions tagged [model]

representation of an object

74 questions
info Newest Frequent Votes Active Unanswered
0
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0answers
21 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 ...
0
votes
0answers
14 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 ...
0
votes
1answer
38 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 ...
0
votes
0answers
66 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
votes
1answer
42 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 ?
0
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1answer
53 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 ...
1
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0answers
40 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
vote
1answer
26 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, ...
0
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0answers
41 views

Text to legend based on attributes?

I am currently using the data driven pages with dynamic text to populate information within the legend. Is there another way to do this as I have quite a few maps to make and would like to automate ...
1
vote
1answer
40 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 ...
5
votes
1answer
199 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
vote
1answer
284 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
votes
0answers
84 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
votes
1answer
96 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
votes
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
votes
1answer
296 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
votes
1answer
60 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
votes
1answer
996 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 ...
0
votes
0answers
65 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
votes
1answer
1k 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
votes
0answers
139 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
vote
0answers
55 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
votes
1answer
193 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
15 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
votes
1answer
145 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[]<-...
3
votes
2answers
97 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
votes
1answer
310 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
votes
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
votes
1answer
323 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
vote
1answer
533 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
vote
0answers
124 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
votes
2answers
187 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
vote
4answers
118 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
vote
0answers
29 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
votes
2answers
390 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
votes
2answers
238 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
votes
0answers
124 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
votes
0answers
213 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
votes
1answer
585 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
vote
3answers
2k 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
votes
1answer
415 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
vote
1answer
279 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,...
0
votes
1answer
175 views

How to use iterators in ModelBuilder to create new feature?

I am attempting to use ModelBuilder to automate the process of plotting parcels of land that are related to mineral leases. The existing lease feature class contains information related to reference ...
3
votes
3answers
3k views

3D soil profile from borehole information

I wonder what would be the best option if I want to build a 3D soil model in GIS from borehole information? Basically I want to generate several 3D soil layer surfaces. Can everything be done using ...
6
votes
2answers
2k views

Exporting model to Python script in QGIS?

Where has the export model to Python script option gone in QGIS 2.6.0?
1
vote
0answers
1k views

Making air pollution model in QGIS [closed]

I'm writing a bachelor thesis about air pollution from point source and I want, to put it to GIS, but I don't know really how... I'm working with Gaussian plume model, so I have pollution ...
1
vote
0answers
86 views

Data occurrence in openModeller?

I am having problems adding occurrence data to openModeller and I think that the format might be the problem. I am using Excel with the fields: #ID Taxon Name Longitude Latitude. I saved the result ...
0
votes
1answer
872 views

Model builder - Create a new File GDB then convert a CSV into a file GDB table in new File GDB

I am trying to create a model to create a new file GDB. The model would then iterate through a folder of CSV tables, convert them to file GDB tables and add them to the newly created File GDB. I ...
3
votes
0answers
339 views

Gaussian plume model in PostGIS or geocouch [closed]

Does anyone know of existing code for dispersion modeling using Gaussian Plume or comparable model, that I could plug in / adapt to be used programmatically from PostGIS or alternatively via GeoJSON/...
2
votes
1answer
238 views

Sort polygons from north to south in QGIS using 'graphical modeler'?

I'm building a model in 'graphical modeler' in QGIS 2.2. I want my model to clip a polygon layer and give the polygons coordinates so that I could sort them geographically from north to south. After ...

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