Tagged Questions

representation of an object

learn more… | top users | synonyms

0
votes
0answers
27 views

Creating a 3d terrain model using a DEM raster file

i have a DEM Raster file and i would like to create a 3D Terrain Model using ArcScene. Is this possible, if yes, how? Thanks.
1
vote
0answers
67 views

Making air pollution model in QGIS [closed]

Im writting bachelor thesis about air pollution from point source and i want, to put it to GIS. But i dont know really how ... Im working with Gaussian plume model, so I have pollution concetration ...
1
vote
0answers
18 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
0answers
23 views

Doing joint hypothesis test in spatial regression using R?

I'm doing estimation of spatial lag/error model using R package "spreg"/"spdep" but I cannot find any method to do anhypothesis test after regression. For example, I want to test whether two ...
0
votes
1answer
90 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 ...
1
vote
0answers
80 views

Gaussian plume model in PostGIS or geocouch

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 ...
0
votes
0answers
47 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 ...
0
votes
1answer
332 views

How to merge output shapefiles in model builder

I have a layer with several polygons and a road map. I need to take each polygon and use it to clip the road map, dissolve all of the road records into one, and then merge the polygons into one ...
2
votes
1answer
138 views

How do I add a column in an attribute table using QGIS graphical modeler?

I have started to make a model in QGIS 2.2 graphical modeler. I have made a buffer around a polyline and used it to clip a polygon layer. So far i t works. But the next step is to add a new column ...
1
vote
0answers
54 views

How to use Record Set to prepopulate table in ModelBuilder?

I'm running ArcGIS 10.2.1. and am trying to prepopulate a record set in model builder. The record set is set as a Modeled Parameter. I open the record set enter the information into the table and ...
1
vote
1answer
123 views

Running model in QGIS gives ERROR: Missing mandatory parameter?

I am trying to make a batch model to convert band 2 and band 1 MODIS 8 day composites into NDVI. The input files are in tif format, but I want the output to be saved in Idrisi .rst format. I am ...
0
votes
1answer
54 views

Model builder to call python script

So I'm looking to write a script that can be called by model builder. What I would like this script to do is to select three records from a feature class that have the highest field values ...
5
votes
3answers
628 views

real-time weather forecast raster for Europe

I am trying to find a numeric weather forecast map (air pressure, temperature, snowfall, precipitation..) that I could display in my web map client. For the client I'm currently using OpenLayers with ...
0
votes
3answers
710 views

Create new layer by selection within ModelBuilder in ArcMap 10?

I have a basic abutters model built so far. Right now I have it set up to: Select a parcel by an expression. Buffer parcel by a value. Select by location which highlights all parcels within the ...
2
votes
1answer
268 views

How to create and visualize groundwater plume models?

My water department has asked me about visualization of groundwater plume models. I have no idea where to start. All the links refer me to Cameo/Aloha but these are for Atmospheric modeling as far as ...
1
vote
1answer
55 views

Arcgis 9.3 Conditional Statement

I'm having trouble performing calculations with single output map algebra ArcgIS 9.3 using conditional statements and applying it to several model outputs as they are generated: The statement is: ...
-1
votes
2answers
195 views

Build a model sequence or merge models in ArcGIS

This is surprisingly difficult to search for, so I'll ask though it may be a silly question. Is it possible to chain several model-builder models in sequence, such that one will automatically run with ...
1
vote
1answer
234 views

Use of Raster Calculator in ModelBuilder

I have the following equation: 3000*(1-exp((-0.000664)*input raster)) I want to make a tool to use this equation on raster images. I want to do this with the Raster Calculator with the help of ...
1
vote
1answer
132 views

Pass Queried Feature Set to geoprocessor as a parameter

I am new to geoprocessing services and tried to publish my first. I created a simple model with one parameter, a featureset, and I am intersecting it with another layer which is specified in the ...
5
votes
2answers
152 views

Different models, different contours: are they comparable?

I will get contour lines of electromagnetic field strength around power lines. The contours will be calculated by different agencies using different models. We need to check whether the resulting ...
0
votes
0answers
28 views

tin model in Qgis [duplicate]

I am having DSM and DTM data .My primary objective is to develope a CHM(Canopy Height Model) in Qgis.which i have done already but in my company they are stressing that CHM model which i already ...
1
vote
2answers
377 views

How to develop a Canopy Height Model of LIDAR data in QGIS?

I am having a DTM and DSM files .I want to develope a Canopy Height Model in Qgis is it possible?
0
votes
1answer
169 views

Geodjango InspectDB Fails on Postgis Raster_Columns View

I am trying to generate models for an existing Postgresql database using the Django InspectDB command. Models are produced but a failure occurs on the raster_columns view. The error is: Exception: ...
0
votes
1answer
337 views

ArcGIS 10 - Model for batch select polygons by attribute and merge them together

Is there is a way to create a ArcGIS 10 MODEL to: 1. batch select polygons from the same layer by attribute 2. merge these polygons into one 3. repeat this for all polygons shearing the same ...
1
vote
0answers
288 views

SAGA kernel density error with Sextante Modeler

I can succesfully perform SAGA kernel density analysis with Sextante (1.0.7) in QGIS 1.8.0. But i want to built an automated tool for this job with Sextante Modeler. But i got foolish errors. This ...
3
votes
0answers
98 views

Can layers from Spatialite db be used as input for a Sextante model?

I'm trying to build my first models in SEXTANTE and already fail at the start. It seems not to be possible to add a vector layer which derives from a database. Orginally, the layers are from a .mdb. I ...
3
votes
1answer
115 views

Lightning Data Analysis

Hi I am new to model builder in GIS. I have two shapefiles, one is a polygon shapefile of all lightning caused fire in Alaska sine 1939 (~1500 polygons) and the second is a point shapefile with all ...
3
votes
0answers
244 views

How to solve the problem when buildings are extruded without roof?

I tried to extrude buildings in ArcScene with Extrusion function in Layer Properties. But most of the buildings seem like only their walls are extruded. Instead of solid blocks, they appear like no ...
1
vote
1answer
93 views

Is a new map object required in order to create a wms overlay on top of a current map object with wfs layers using the leaflet api

I am trying to add a wms tile layer overlay over a wfs tile layer which I added to a map object. When I tried to simply add a layer on top of my current setView for my map object it overwrote the ...
3
votes
2answers
606 views

How to speed up the process of vector data visualization for a web application

I have a GIS web application and vector data that is going from the model to the web application. For developing the User Interface I am using JavaScript and OpenLayers. But sometimes the amount of ...
3
votes
2answers
275 views

How to generate Buildings ID numbers inside parcels

In order to decrease manual data entry, I would like to automate a task to generate numbers for all buildings inside a parcel starting with 1. For example, I have 4000 parcels and each parcel has ...
2
votes
1answer
143 views

How to rename rasters in directory based on field value of their centroid feature class in ArcGis?

I have a lot of rasters named like r001.tif, r002.tif and so on. There is a point shapefile with centroids of these rasters and their real name in the attribute table. I'm looking for a way or some ...
7
votes
2answers
266 views

How do you treat partial 3d features in PostGIS?

We have features from survey data that contain partial 3d information. The most common example would be a 2D LineString representing a road, that contains elevation information in certain points ...
4
votes
1answer
574 views

Nested Iteration with model builder - using nested models

I'm new to using model builder and have to do a nested iteration (for every month I have to iterate through 6 parameters). I am thinking of doing that by using nested models. One model doing the ...
2
votes
1answer
896 views

Modelbuilder - Feature Dataset Iterator

I had posted this on the ArcGIS forums, but thought I may get some further input here. Having issues acquiring the appropriate input and erase features during the iteration process. Please see ...
11
votes
2answers
655 views

Regression Model and Spatial Autocorrelation

I have used OLS and GWR for validating the dependencies between two distinct database. The Residual Square for GWR is 0.82 and thereby making it the right regression model to be used for determining ...
1
vote
0answers
158 views

How to create a dynamic distance calculator for selected line feature classes?

My situation: I am relatively new to GIS so forgive me if this is a stupid question. I am working on a project at a park that I am interning at where the goal is to create a single feature with ...