Geographic Information Systems

Questions tagged [water]

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Working with the FlowDir in the national hydography dataset

In the National Hydrography Dataset there's a FlowDir field. According to https://www.townofnewipswich.org/sites/g/files/vyhlif4766/f/uploads/dataset_dictionary.pdf the two possible values for FlowDir ...
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38 views

How to remove areas of water from the US census tract map using R/RStudio

I am trying to aggregate all of the census tracts in the United States for analysis and display, including a realistic depiction of water features when zoomed in. I run into memory issues when doing ...
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18 views

MapBox Studio: Styling Water in template dataset

I am using MapBox Studio with their own template dataset called Outdoors. I discovered that categories of waterways can be addressed by classes such as river, stream, stream_intermittent etc. This ...
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1answer
45 views

Creating new vector which is “inverse” of existing vector (e.g. water surrounding island) in QGIS [duplicate]

I want to create a new vector layer which represents the surrounding water of a particular island I am working with in QGIS. Is it possible to create a water shape based on an "inverted selection&...
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EarthEngine - Create a Clipped Global Surface Water Occurrence Layer

I am looking to create an inland surface water layer using Earth Engine. The JRC Global Surface Water Mapping Layers, v1.2 - Occurrence band is exactly what I want, but as you can see in the attached ...
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30 views

False positive results while mapping water bodies

I am a veterinary epidemiology researcher interested to benefit livestock in a desert. As water is an important resource for herders therefore I have become interested to map water bodies.I learned ...
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3answers
154 views

Generating multiple water level scenarios with only DEM data in QGIS

I want to depict certain water level scenarios (from -0,40mNN to +0,20mNN) by using a two dimensional hypsometric map. Only provided data are DEM-files of the AOI. I managed to create the hypsometric ...
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30 views

How do I draw polygons from aerial imagery?

I will be working on a project to automatically identify ponds from satellite imagery. I have uploaded the basemap into ArcMap 10.7, but I can't create a feature layer to start editing. How do I add a ...
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20 views

R SPEI package on waterbalance timeseries for multiple locations with NA's: unexpected data output distribution

I want to use the spei() function in the SPEI package on a waterbalance dataset from 2015-2020 of 99 locations. The waterbalance is calculated out of MODIS PET values (8-day summed to monthly) and ...
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66 views

Surface area of waterbodies for multiple location using Google Earth Engine

Using this code, I've extracted surface area of water bodies (for a period of 6 years) from sentinel 1 GRD dataset. But how can I compute water area extent of multiple location and produce chart/CSV ...
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29 views

Overcoming error : classified: Layer error: Image.reduceConnectedComponents: Label band must be integer valued, found type 'Float'

with following code , I am getting error message https://code.earthengine.google.com/15a22656f680c38ff0bf10afd2747c5f classified: Layer error: Image.reduceConnectedComponents: Label band must be ...
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42 views

Making GEE code for Pansharpening Sentinel-2

The following link contain information about Pansharpening Sentinel-2 https://leclab.wixsite.com/spatial/post/pansharpening-sentinel-2-imagery-in-google-earth-engine The code in picture form and long ....
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1answer
314 views

GEE – Smoothing curve of detected water area

I am trying to plot the time series chart of the detected water area by otsu's method in Sentinel-1 images as a smoothed average curve. I found two approaches to this for the Google Earth Engine: ...
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1answer
44 views

Techniques to map small water bodies in desert

Techniques to map small water bodies in desert I have task to map water bodies in a desert. I used landsat 8 and calculated three indices called NDMI, Tasseled Cap Wetness, & AWEIsh. I am ...
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39 views

select waters pixels in GEE as magic wand tool

I am interested to map small water bodies in a desert . I used Gond method described in an article entitled "An Assessment of Surface Water Detection Methods for Water Resource Management in the ...
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1answer
77 views

mapping of small water bodies in desert

I am trying to map small surface water bodies in a desert. The code and methodology attached. My issue is , water pixels don't cover full extent water bodies (screen shot attached) . ? What ...
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42 views

Map surface water bodies in a desert

I am interested in mapping surface water bodies in a desert. I have used Tasseled Cap Wetness (TCW) in GEE. After running my code, I found that water bodies (locally called tobas) were not marked. I ...
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85 views

Checking if network has connection errors

I have given a network of a city in dwg. I made a dxf that only contains the network itself, and created a layer for every type of pipe (like 25KPE, 80KPE etc...). How do I check if the network is ...
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74 views

ArcGIS Pro Arcade expression to Maintain line-to-point connectivity

A customer was using a geometric network to maintain connectivity between lines and points. Now they are using ArcGIS Pro, which does not support geometric networks. They cannot use the Utility ...
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1answer
606 views

Calculating water occurrence of Sentinel-1 images in Google Earth Engine

I would like to derive the occurrence of surface water bodies from Sentinel-1 image collection in the Google Earth Engine.In my example I could already compute the water mask using Otsu’s method for ...
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18 views

Scale national economic data down to a watershed

Economic Input Output databases such as e.g. the World Input-Output Database by the European Commission contain economic (and often environmental) statistics. The spatial resolution of data provided ...
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41 views

Creating a “Stream Order” of canal system using ArcMap

I'm interested in creating a "Stream Order" for our canal system. I am the GIS Specialist for an irrigation district. I would like to have the ability to have a layer for when I click on a section of ...
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246 views

SVG symbols for water management

I'm searching for SVG of different (german) hydrant types ("Unterflurhydrant", "Überflurhydrant", "Hydrantenschacht") etc. The symbols are currently stored as polygons in MapInfo's proprietary .TAB (...
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1answer
265 views

Extract data from osm.pbf with GDAL

I tried osmosis, osm2pgsql, osmfilter, and probably most of OSM related tools in order to extract polygon rivers and water bodies. Among the tools, OGR is intuitive and returns good results so far ...