Questions tagged [water]

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Calculating Lake Turbidity in GEE [closed]

I am determining water quality parameters using Google Earth Engine. So far I have calculated Ph, Dissolved Oxygen, Temperature, Suspended Material, Dissolved Organic Material, using bands calculation ...
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-1 votes
1 answer
33 views

Summarizing a watermains layer to show pipe footage in miles for each material type and the percentage of each type [closed]

I have a water mains layer with a pipe material field and length field. I need to summarize this layer broken down into the length of each type of pipe material in miles. Currently, everything is in ...
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1 vote
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24 views

ArcGIS Dashboard [closed]

I need to make a dashboard that shows proposed mains in our water system. I know I can do this by making a list and setting the lifecycle status to proposed. The problem is that I need another list ...
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2 answers
25 views

coverage layer as water network [closed]

I have polyline featureclass as water network. I want to create polygon layer around these line to became coverage layer but I want that to be automated and isn't manual.
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0 answers
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Iterating classifier over an Image collection in GEE

we are trying to run the random forest classifier for multiple images in an image collection. Please let us know how to do this. we have tried the following, but we are getting this error. var ...
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1 vote
0 answers
50 views

Correcting color of soil and water using QGIS

RGB single band image merged together result as shown in photo. After I merged them, I found out the blue color part is actually soil, but show up in blue instead of brown or actual soil color. How do ...
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21 views

How to download NHDFlowline data for the Lower Colorado (area 15)

https://www.epa.gov/water-data-and-tools/nhdplus-lower-colorado-data-vector-processing-unit-15 doesn't seem to have a download link. Maybe https://nhdplus.com/NHDPlus/NHDPlusV2_15.php has them but ...
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  • 205
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1 answer
247 views

Earth Engine calculation of distance between points to nearest water

I have a list of points and I want to calculate the distance between each of them to the nearest body of water larger than n=10 pixels. In other words, for each point, I want to return a number ...
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  • 103
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1 answer
52 views

How to make histogram of NIR band bimodal enough to differentiate water from land in GEE? [closed]

I am interested to map water bodies in a desert from swir band of sentinel 2. How I can make a bimodal histogram in GEE? I have one reference water body in scene. Is it possible to do the same in ...
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2 votes
0 answers
91 views

Finding where to close polyline using QGIS technique that resemble how US Census Geography's Inland Water is calculated

One-liner version of the below: given a polyline is it possible to determine where to close it (to form a polygon) using a single line segment that's no more than 1 nautical mile long while ensuring a ...
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0 answers
34 views

Linear regression - water column correction

I am curious what the best way is to do a linear regression between depth (y) and b2/b3 radiance (x). My goal is to derive the slope and y-intercept to plug into the equation z = m1*ln(b2/b3) - m0 [m1:...
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2 votes
0 answers
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Estimating the water coverage area behind a dam

I have a task to estimate the area that will be covered by water when a dam is built in the provided location. The only thing I have is the max water level calculated for the reservoir. Is that enough ...
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3 votes
0 answers
66 views

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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  • 205
1 vote
1 answer
268 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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0 answers
51 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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  • 165
2 votes
1 answer
90 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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2 votes
3 answers
463 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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0 answers
85 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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3 votes
1 answer
681 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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1 vote
1 answer
92 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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0 votes
1 answer
156 views

Mapping of small water bodies in desert environments

I am trying to map small surface water bodies in a desert. My issue is: water pixels don't cover full extent water bodies (see screenshot attached). What threshold values would I need so that water ...
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1 vote
0 answers
55 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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1 vote
0 answers
132 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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1 vote
0 answers
94 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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2 votes
2 answers
1k 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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0 votes
0 answers
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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0 answers
48 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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2 votes
0 answers
499 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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  • 2,219
1 vote
1 answer
421 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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