September 15, 2023

How to download Actual Evapotranspiration ET raster data (MYD16A2) with Python and Earthaccess - Tutorial

September 15, 2023/ Saul Montoya

Evaluation of environmental processes requires a spatial temporal approach with the right tools to represent, process and analyze raster data. The process of satellite imagery selection on a web server is highly manual with limited options to manage an intensive amount of datasets. There are packages available to download certain Nasa imagery with Python, but the Earthaccess library allows users to download different dataset with options to login, select by time and location, and define folders to download data.

We have done a complete process to download actual evapotranspiration (MYD16A2) imagery with Python and Earthaccess for a given period and location. The files are stored in a folder and represented with QGIS.

September 12, 2023

How to create a Piper plot online with Aquifer App - Tutorial

September 12, 2023/ Saul Montoya

We present our own webapp for the representation of the Piper Diagram, Stiff Diagram and Scholler Diagram. The webapp was developed in Python Django and it is entirely free for everyone. The main objective behind this webapp was to develop a user friendly and minimum requirement tool to create these water quality / hidrogeochemical diagrams. The video tutorial shows the complete procedure to update the working file and then generate the diagrams.

September 04, 2023

Online determination of Time of Concentration from a Raster DEM with Hatari Utils - Tutorial

September 04, 2023/ Saul Montoya

Hatari Utils is our app for different hydrological analysis. The app provides the geometry of the basin, river network and main river as ESRI shapefiles and based on the output from the delineation we can determine the Time of Concentration under several formulas. The app also gives the mean and median of all time results.

September 02, 2023

Modeling of mixing water / effluent with OpenFoam and HatariUtils - Tutorial

September 02, 2023/ Saul Montoya

Modeling flow on open channels and simulating water mixing to evaluate the final concentrations and mixing area was a hard task with conventional open source software. Based on our research and app development we came up with a process to model flow of water and effluent mixing and then calculate the mass flux with the initial concentration of certain chemical components to have a fully 3d simulation of the concentration development with time and distance from source.

August 24, 2023

Web representation of water chemistry data and hydrological features with Qgis2Web and Github

August 24, 2023/ Saul Montoya

As for the myth of Icarus who wanted to fly close to the sun, sometimes normal Qgis users want to fly close to the web however our “wings” are unknown. Qgis2Web is a robust Qgis plugin that is 8 years old, has more than 177 releases and allows a normal Qgis user to fly to the web with minimal knowledge of html, javascript or other web standards.

August 17, 2023

State of the art of open digital elevation imagery and online watershed delineation - Tutorial

August 17, 2023/ Saul Montoya

The processes of working with digital elevation models (DEMs) and watershed delineation are in constant change over time. Even though the elevation datasets date from 10 years ago; the web servers and tools for data processing have changed in recent years. With online tools such as Hatari Utils, the watershed delineation can be performed in a few steps with practical outputs as vector files and watershed statistics.

August 11, 2023

3d visualization of Modflow 6 models with Model Viewer - Tutorial

August 11, 2023/ Saul Montoya

Model Viewer is an excellent option for the visualization and even the animation of MODFLOW models. There is a version of Model Viewer for Modflow 6 models and another for the rest of MODFLOW versions. This tutorial deals with the whole procedure of 3d model visualization that covers the model import, setting up the vertical exaggeration, making isosurfaces, show flow direction arrows, plotting boundary conditions among other features of Model Viewer.

August 07, 2023

How to make a wind rose online with Hatari Utils - Tutorial

August 07, 2023/ Saul Montoya

This is an applied tutorial for the online representation of a wind rose with Hatari Utils from wind speed and direction stored on an CSV file or inserted in an online form. The tutorial explores the online options of Hatari Utils to represent windroses as bars, boxes, polygons or contours.

July 31, 2023

Spatial data processing for groundwater modeling in Model Muse - Tutorial

July 31, 2023/ Saul Montoya

Groundwater model creation requires a complete set of spatial data for the different hydraulic parameters, boundary conditions and other model items. Vector and raster data need to be preprocessed, converted, reprojected to fit the requirements of Model Muse.

This tutorial covers an applied case of raster and vector data processing for a groundwater model over the Oahu island (Hawaii, USA). The tutorial covers the steps to download the data, extract the river network and import the spatial data into Model Muse.

July 26, 2023

Online main channel determination from a river network with Hatari Utils - Tutorial

July 26, 2023/ Saul Montoya

If you want to determine the longest channel of a river network automatically this feature Hatari Utils might be of your interest. Hatari Utils is a toolbox for different analysis in water resources and beyond. On the “watershed delimitation” tool you can define the catchment, the river network and now you can define the main channel (longest succession of segments that connect a source to the outlet of the basin) automatically on the catchment delineation.

July 24, 2023

Online watershed delimitation with Hatari Utils - Tutorial

July 24, 2023/ Saul Montoya

Never before the process of watershed delimitation became so easy. We have developed an online tool for basin and river network extraction from a geospatial raster and export them as ESRI shapefiles. This app allows to process a river basin in few steps on a extremely friendly environment.

July 17, 2023

How to measure strike and dip from rasters with QGIS and ThreePointMethod plugin - Tutorial

July 17, 2023/ Saul Montoya

If you have a geological contact as a geospatial and you want to calculate/measure the strike and dip at a certain point, this tutorial might help you. The ThreePointMethod is a QGIS plugin that calculates a plane strike and dip direction using the three-point method. It works with a point shapefile and a digital elevation model.

July 17, 2023

Are hydrogeologist/numerical modelers alone by nature?

July 17, 2023/ Saul Montoya

This can also be a title for this article: Are hydrogeologist/numerical modelers fundamentally alone? We can define "loneliness" in many different ways that range into different stages of human behavior. As we are not in a discussion of what Kant could have defined loneliness, let's define it in a practical way that you are alone as not you are not with someone. This is kind of a definition like: you are because you are not what you aren't.

June 22, 2023

Online Mapping Urban Temperature with Istsos and Python - Tutorial

June 22, 2023/ Saul Montoya

Geospatial mapping of environmental variables is key to understand habitats and in this case urban habitats. We have done research in temperature mapping stored in the cloud with Raspberrys and a Istsos server, this time we have coupled a gps sensor to make urban temperature map from the data retrieved from the server. This tutorial shows the procedure to retrieve the data, convert it to a geopandas datagrame, export as ESRI shapefile and undertand the temperature distribution relation with the land cover.

June 12, 2023

How to install the geological Python library Gempy in Windows with WSL - Tutorial

June 12, 2023/ Saul Montoya

Gempy is an open-source library for modeling geology written in Python. The library is capable of creating complex 3D geological models including structures, fault networks, and unconformities and it can be coupled with uncertainty analysis.

This tutorial is developed under a Ubuntu 20.04.2 image installed from the Windows Store and covers all the steps to setup the user, install core packages, install Python packages and set up local paths to have a complete Gempy enviroment running under Jupyter lab.

June 02, 2023

Journal of online sensor setup on a Raspberry Pi under the Istsos framework (SOS Standard)

June 02, 2023/ Saul Montoya

We dont call this article a tutorial since not all steps of the sensor settings would be explained. It might be the idea of this article to show the general panorama of the sensor installation on a Raspberry Pi under the Istsos framework that implements the SOS standard.

May 15, 2023

Groundwater flow modeling using Dupuit approximation with Python and Landlab - Tutorial

May 15, 2023/ Saul Montoya

This tutorial covers a simulation example of groundwater flow and groundwater discharge with the GroundwaterDupuitPercolator component of Landlab. Simulation is run on steady state over a one layer aquifer and results are plotted on charts and grids.

May 10, 2023

Channel network delimitation from a raster DEM with Python and Landlab - Tutorial

May 10, 2023/ Saul Montoya

Based on the several components of Landlab together with other Python packages some procedures can be established to extract single or multiple stream networks from a digital elevation model (DEM) raster and export them as vector spatial data formats as ESRI shapefiles or plot them in Jupyter Lab.

May 08, 2023

Land Cover Change Analysis with Python and Rasterio - Tutorial

May 08, 2023/ Saul Montoya

This tutorial covers the complete procedure to create a land cover change raster from a comparison of generated vegetation index (NDVI) rasters by the use of Python and the Numpy and Rasterio libraries. Results of the NDVI for given years and NDVI change are plotted on Jupyter Lab as color grid and contour grid.

May 04, 2023

Calculation of steepest slope dispersion with drainage area with Python and Landlab - Tutorial

May 04, 2023/ Saul Montoya

Surface analysis at regional level requires a higher degree of calculation to assess several topics of land management. Usually those types of analysis over raster files were limited to GIS desktop software with results for a single raster and with limited options to create pixel value charts.

Python, Rasterio, Landlab and other high performance packages allow us to have another view of our surface elevation and evaluate different variables that were unthinkable over traditional GIS software. This tutorial shows the complete procedure to open a raster file with Rasterio, import as a Landlab model grid, fill sink and calculate the drainage area. Finally from the Landlab results a dataframe was constructed and the drainage areas were classified in intervals to be plotted on a boxplot with the steepest slope.

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