Questions tagged [maxent]

Software and algorithm for ecological niche modeling.

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29 views

Error saving .asc bias file in R

I used the following code to create a bias file in R for MaxEnt. I am able to create the bias file, but I am not able to save it as ascii (see error message). My lat/lon csv file contains only points ...
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17 views

Maxent Fatal error: java.lang.ArrayIndexOutOfBoundExceptions: 44

I have come across a fatal error for some of the species I am modeling: Fatal error: java.lang.ArrayIndexOutOfBoundExceptions: 44 (or other numbers). The error only occurs when I am selecting "...
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23 views

Maxent SDM projections coming up almost entirely blue

I have been generating SDM models and projections in Maxent. I have had some success with one set of variables (some Hydroshed variables mixed with World CLIM variables); however, I am having a bit of ...
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1answer
32 views

Maxent can't get past “javalang.ClassCastExeption: [D cannot be cast to [F” error message

I have turned all stones I can think of how to solve this, and it feels like it should be something simple I am missing, but I just can't get Maxent to work. When Maxent (v.3.4.3) reaches the step &...
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17 views

Computing max values in a ImageCollection and extracting original band values for each pixel in Google Earth Engine (GEE)

I am working in species distribution models. Currently, I have an ImageCollection where every image represents a specie. Each image has two bands: one holding values of probability of presence, the ...
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34 views

Bootstrapping Reclassified Layers of Two Species in QGIS for Suitable Area Overlap

I have a very surface-level knowledge and familiarity with QGIS. I currently have 30 reclassified QGIS layers of suitable area based off of 30 MaxEnt individual runs for 2 different species. All ...
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19 views

MaxEnt in RStudio ENMeval Error

I am trying to run a MaxEnt in ENMeval to select the best performing model with differing regularization multipliers and feature combinations. I am not that strong in RStudio but have been advised ...
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30 views

Calculating AICc value from Maxent output

I want to calculate the AICc value for my Maxent models. On a little search, I have found that calc.aicc function if implemented in R, can help in finding out the AICc value. But, I am not sure, what ...
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20 views

'No-data' location in predictor variables of Maxent

In Maxent analysis, is it necessary that all the environmental layers should have 'no-data' at the same places. I have 19 bioclim variables and few others from CGIAR. Both of the sources are not ...
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31 views

Error when executing maxent algorithm with categorical variable

I tried to use maxent algorithm where I have categorical variable as follow : mod <- dismo::maxent(x=env, ## env conditions ( rasterstack) p=Pre_final, ##(...
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1answer
78 views

How maxent's algorithm uses data to predicte distribution of species

Using the same list of occurrences with present and future bioclimatic variables (worldclim) I get two obviously different distributions. In the case of the future projection, I assume that the ...
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70 views

Problem with definition of categorical variables in dismo package

I'm working with a package dismo: Species Distribution Modeling and I have all my environmental variables as categorical. I used "factors" argument as follow: mod <- dismo::maxent(x = ...
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15 views

Average area calculation differences between raster stack and single Maxent models

I ran 100 bootstrap replicated models, for which I want to calculate the area of suitable habitat based on three different threshold rules (MTP, ESS and MaXSS). The issue I'm having is that for the ...
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1answer
34 views

How to generate one raster layer from multiple binary rasters for input in MaxEnt

I have multiple binary rasters (calculated from raster calculator) in ArcMap. Now, I want to convert them all into one raster. Mosaic and Composite tools of ArcMap seem not helping here. I am not sure ...
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1answer
51 views

How to process environmental data for the input in MaxEnt (or any other modelling platform)

I have downloaded some environmental rasters from Worldclim. Now, I want to generate an environmental layer for MaxEnt by applying conditions on those rasters. These rasters are 32 bit, floating point ...
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1answer
248 views

Difference between Bootstrap and Cross Validation MaxEnt

I didn't know which method to use cross-validation or bootstrap in maxent so I ran both and my AUC values for each method are quite different for bootstrap I have an AUC of 0.758 and for cross ...
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21 views

MaxEnt Outside Boundary Error

I have prepared all my environmental layers and occurrence points for MaxEnt. They are all projected as WGS 1984 UTM Zone 37, all have 149 rows and 262 columns when I view in ArcGIS all of the data is ...
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1answer
117 views

Calculating Euclidean distance in ArcGIS

I am willing to model the distribution of an amphibian species in relation to climate and land cover in MaxEnt. For this I have downloaded the WorldClim data and the Global Consensus Land Cover (https:...
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1answer
220 views

No Data was found error after applying a MaxEnt classifier (GEE)

I am trying to redo this tutorial: https://developers.google.com/earth-engine/classification, using the MaxEnt classifier with my data. Code: https://code.earthengine.google.com/...
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1answer
185 views

Getting startAsciiWriting (x, filename, …) error in R?

I am new to R. I am trying to transform elevation data in R for input into MaxEnt. Returned: Error in .startAsciiwriting (x,filename ...): x has unequal horizontal and vertical resolutions. Such ...
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680 views

Maxent error: Error projecting, two layers have different geographic dimensions

When I run climate data (signed 16 bit) and land use data (unsigned 8 bit) on Maxent, I got an error message: Error projecting: java.io.IOException: Files bio6 and alt in directory D:\WorldClim\...
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1answer
166 views

Extracting residuals of maxent model in R?

I used "dismo" package in R, and ran a build a maxent model. Now I want to extract the residuals from the model in order to run a Moran I test later. But I got an error. The code was like: xm<-...
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1answer
31 views

How to create multi-scale variables from landcover data

I have calculated raster files with values of 0 and 1 for each landcover attribute I am interested in. I would like to make multiple raster files containing different cell sizes. e.g 100m2, 500m2, ...
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2answers
2k views

Converting .tif to .asc for MaxEnt

I want to convert some .tifs to .asc to use in MaxEnt. I have tried using both ArcGIS 10.5.1 (the "Raster to ASCII" tool) and QGIS 2.14.3 (Raster > Translate tool). Both give .asc files, but when I ...
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0answers
108 views

Points and bioclim layers plot correctly in R, but not in Maxent.jar

I am trying to use Maxent.jar. This program uses a CSV file of points and ascii bioclim layers (basically, a map of the Americas with climate data) and overlays them on top of one another. I find ...
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1answer
144 views

Can I consider as continuous data vegetation layers on Maxent?

I would like to know if we can consider as continuous data vegetal layers when disposed on seperate different .asc files (e.g.: Barren.asc; Water.asc; Evergreen Broadleaf Trees.asc; etc.)? The data on ...
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1answer
394 views

Running MaxEnt modelling in “dismo” using “loop” and storing the results in seperate objects and folders [closed]

I am doing a MaxEnt modelling using "dismo". I am using a loop to give multiple runs. I wanted to save results from individual runs in separate objects and at the same time the results from individual ...
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1answer
969 views

java.lang.NumberFormatException: For input string: “-?”

I'm getting an error in Maxent which arises from one of the output files created by Maxent, in this case the _ASCII_novel.asc at row 159 column 444. However, the data in this position appears to be OK....
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1answer
158 views

Extracting raster values from polygon perimeters using ArcGIS Spatial Analyst?

I am currently working on a project to identify local ponds or water bodies that have high probability of species occurrence. I'm using BioClim climate data, SSURGO soil data, and a DEM layer for a ...
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1answer
626 views

How can I calculate averaged response curves for Maxent models fitted using maxnet package in R?

Could someone please point me towards an efficient approach? plot and response.plot (maxnet package) can produce response curves for individual models, but feeding a list of model replicates, as ...
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1answer
891 views

dismo - Plotting individual predictor responses

I have a MaxEnt model implemented in dismo package. The package has the convenient function response to plot predictors' responses as the ones provided by the model html output, in R plotting style. ...
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0answers
80 views

'Spline' tool in ArcGIS Pro keeps dropping collinear points

I am trying to convert the WorldClim dataset from their original resolution of 30 arc-seconds (WGS1984) to 25m cells (OSGB British National Grid) for use in Maxent modelling. I clipped the ...
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2answers
538 views

Translating tif rasters to asc taking a long time

I need to use the 19 WorldClim variables in MAXENT, so I have to take the .tif files to .asc files using the translate tool. It's taking forever for me (2% after 2 hours). I've given up. I know its ...
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1answer
1k views

Maxent error 'java.lang.NumberFormatException: For input string:“Z^,,,”'

I converted a shp file into asc file in QGIS. Then I tried running the Maxent with that enviromental layer and came across that error message: java.lang.NumberFormatException: For input string:“Z^,,,”...
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0answers
120 views

rasterizing for maxent? [closed]

Im working with MAXENT and im having trouble using some shapefile files with critical variables. I rasterized the shapefiles into rasters selecting one attribute from the attribute table, but before ...
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2answers
737 views

MAXENT and shapefiles?

I'm trying to make a Potential Distribution map for an animal species that, we think, should be dependent on edaphic variables. The problem is the only maps I could find with edaphic information are ...
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1answer
190 views

Kriging predictions for presence only data with Maxent

I was doing some geostatistical analysis (variogram+kriging) for a "presence only" type data in a species distribution modeling context. Since, we know that when estimating the (empirical) variogram, ...
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0answers
45 views

Maxent and GEBCO incompatibility

I downloaded GEBCO bathymetry data and trimmed all my environmental data with ArcGIS according to my GEBCO mask, but Maxent can't run when I insert the GEBCO data. When I delete it and only run it ...
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1answer
59 views

r.maxent.lambdas command not recognized in GRASS after installing extension

Running Grass 7.0.5 on a Windows 10 machine, I installed the 'r.maxent.lambdas' addon with the g.extension command: g.extension extension=r.maxent.lambdas Downloading precompiled GRASS Addons ... ...
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0answers
520 views

Maxent Error reading output row and column

I need to predict geographical distribution of an insect using maxent. I have converted the bioclim data variable to ascii format to use with the collection records. After loading the files and when ...
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1answer
65 views

Making Raster of Northings (for use in Maxent) in ArcMap?

I'm working on building Maxent species distribution models for rockfish along the Northern California Coast. To do this I need rasters of predictor variables, and I want to capture latitudinal ...
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1answer
328 views

Fixing raster.asc to work with Maxent?

How to fix the raster.asc to work with Maxent? Running Maxent with raster from WorldClim and others as Altitude, LandCover, etc. I have problems because shows up one error (have different geographic ...
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2answers
502 views

WorldClim Variables to Maxent?

I downloaded the Worldclim variables, they are in extension .adf. I want to extract by mask using ArcGis, but when I do the process the new layer is not with the same information than orginal. In fact,...
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2answers
86 views

Creating contiguous dispersal surface between two climate-change scenarios in ArcGIS for Desktop?

I'm modelling the distributions of Australian parrots in response to climate change. I have two climate scenarios (present and future), and have used Maximum Entropy modelling to generate maps of ...
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1answer
303 views

Calculating raster area by converting to points to account for latitude changes?

I am looking at a large geographic area (e.g., continental Africa). I generated a raster of modeled habitat (using MaxEnt) defined in WGS 1984 depicting the hypothetical distribution of an organism at ...
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0answers
91 views

Convert a SHP file set to a categorised ASC raster with Qgis?

I have a shapefile with regolith (soil) data that I would like to use as a categorised raster (say 007_1ASC) in Maxent. The regolith data is in the following files: 007_1.cpg 007_1.dbf 007_1.prj ...
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0answers
182 views

How to create a distance from road raster in QGIS? (Maxent Bias)

I am trying to create a raster to show the distance from a road for an area in Australia. I have the Open Street Map data downloaded and converted to a *.SHP file. Is there a way to produce a raster ...
5
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1answer
2k views

Differences in MaxEnt between 'Biomod2' and 'Dismo' package

I am trying to run an ensemble species distribution, however the the results I am getting for MAXENT.Phillips model are not reasonable projections compared to the Random Forest and Boosted Regression ...
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0answers
272 views

Preparing CliMond data for Maxent

I had been working with BioClim data and that was working in Maxent. I could clip files and realign them etc. Now I have some data from CliMond which is in two formats: Either as text files ...
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2answers
1k views

Changing pixel size in 'asc' file using QGIS?

I have soil data and BioClim data from Australia soil data: rows 2200 columns 1400 pixel size 0.0025, -0.0025 255 BioClim data: rows 660 columsn 420 pixel size 0.00833333, -0.00833333 I am ...