Questions tagged [water]
The water tag has no usage guidance.
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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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1answer
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 ...
2
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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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19 views
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 ....
2
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1answer
314 views
GEE ā 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:
...
0
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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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0answers
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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0answers
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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0answers
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 ...
1
vote
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 Otsuās method for ...
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0answers
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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0answers
246 views
SVG symbols for water management
I'm searching for SVG of different (german) hydrant types ("Unterflurhydrant", "Ćberflurhydrant", "Hydrantenschacht") etc.
The symbols are currently stored as polygons in MapInfo's proprietary .TAB (...
1
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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
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