Questions tagged [water]
The water tag has no usage guidance.
39
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Substracting water mask
I have a polygon with water bodies of my AOI. I would like to clip the water bodies from my NDVI raster layer ( like a water mask). I haven't found a tool in qgis or arcgis pro so far.
Do you have any ...
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9
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Managed aquifer recharge (MAR) and Remote sensing [closed]
What is the process to identify with quantitative data and remote sensing, how a managed aquifer recharge (MAR) has contributed to increased water availability, There is no local data and the area is ...
- 11
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33
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Discontinuity error in Sentinel-1 water map
I tried to generate the water occurrence map from Sentinel-1 to compare with the JRC global dataset. Here is my problem, after calculating the Occurrence of water through sum() and divided it for each ...
- 59
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1
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51
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Error in GEE Function for masking water from Sentinel-1
I am rewriting a code to apply the edge Otsu method for a collection of image in GEE. My code is divided into 2 part, first I determined an image using the Canny edge detection, after that I used the ...
- 59
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25
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What are the steps of assessing groundwater storge from GRACE-FO NetCDF4 data?
I have GRACE-FO data from 2018 to 2022. I want to calculate the groundwater storage and groundwater depth from the data. How can I do that? I have done the same using the google earth engine, but the ...
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1
answer
67
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Applying code to to work with image collection
I found a code for Edge Otsu implementation to detect water body in Sentinel-1 SAR. However, this code only works with one image. I would like to adapt this for the whole image collection. Is there ...
- 59
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40
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Global surface water/ How to compare area of latest image to older images and generate histogram
Based on the Global surface water script, I would like to compare the water decreasing per year and plot a histogram for the area lost per year. I know that there is a dataset that goes by monthly ...
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197
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Water occurrence on GEE using Sentinel-1
I am a new user on GEE. Currently, I found a code for creating a water occurrence on GEE, I tried to apply this code for my AOI, but it have some error while running this.
Error:
ImageCollection (...
- 59
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57
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Calculate accuracy assessment for MNDWI classified image (Overall accuracy, Kappa)
I want to find a way to calculate the accuracy assessment for a classified image (classified by mndwi threshold). I already had the classified image and the reference water body in shapefile format ...
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70
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Where can I find a map of US county boundaries that reasonably shows the boundaries over bodies of water?
Census, ESRI, and others provide shapefiles and feature classes of US county boundaries, but all the data sets I can find seem to clip the boundaries at the shoreline. So they really only show the ...
- 13
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62
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Calculate the area of pixels with values below 0 in NDVI
I'm relatively new in GEE. I'm trying to calculate areas of different type of classification in GEE and I'm having a problem with it. The script code is: https://code.earthengine.google.com/...
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261
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Creating Water distribution network using QGIS
Is it possible to create a water distribution network from an existing LineLayer and existing PointLayer (junctions)?
I want to create an distribution Network with:
selected starting location;
...
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49
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Finding distance from settlement to river in ArcGIS Pro
I am trying to determine how to calculate which specific settlements are within a 30-minute walk from a river polygon on ArcGIS Pro. The country I am focusing on is Nepal, thus, elevation also needs ...
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1
answer
46
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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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35
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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
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40
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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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111
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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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1
answer
657
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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 ...
- 103
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97
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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 ...
- 105
7
votes
1
answer
295
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Finding where to close polyline using QGIS technique that resemble how US Census Geography's Inland Water is calculated
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 maximum polygon area using QGIS?...
- 87
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45
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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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129
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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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1
answer
134
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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 ...
- 332
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607
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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 ...
- 51
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162
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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 ...
- 185
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1
answer
184
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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&...
- 195
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3
answers
772
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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 ...
- 39
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141
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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 ...
3
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1
answer
958
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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:
...
- 173
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110
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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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251
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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 ...
- 105
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69
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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 ...
- 105
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175
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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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124
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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
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2k
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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 ...
- 173
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18
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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 ...
- 499
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53
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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 ...
- 246
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768
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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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577
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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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