Large amount of spatial data is indexed and delivered through files in Hierarchical Data Format (HDF). These files are compatible with desktop GIS software as QGIS but they are not so easy to open/read/process with standard Python libraries as Rasterio, or with dedicated libraries. On our research we found the spatial functionality on the powerful GDAL binaries and library for Python.
Read MoreIf by chance you ended up working with large scale models with long execution times on JupyterLab you might find some restrictions related to the interface itself. Since the model execution is related to the session your computer can go into suspension before the process has finished or you need to keep a tab open to ensure the process is running smoothly. We have explored alternatives to run the model on the background, having some resources to reach the simulation progress and monitoring the process.
Read MoreOrthophoto from drones provide us aerial imagery with spatial resolution in the scale of centimeters. With this high definition and cheap orthophotos we can interpret, analyze and quantify objects on a horizontal distribution by means of machine learning libraries for image recognition and cluster analysis.
Read MoreEvaluation 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.
Read MoreWe 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.
Read MoreHatari 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.
Read MoreModeling 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.
Read MoreAs 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.
Read MoreThe 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.
Read MoreModel 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.
Read MoreThis 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.
Read MoreGroundwater 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.
Read MoreIf 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.
Read MoreNever 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.
Read MoreIf 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.
Read MoreThis 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.
Read MoreGeospatial 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.
Read MoreGempy 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.
Read MoreWe 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.
Read MoreThis 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.
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