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Questions tagged [water]

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Trim/ Extend tool -- doesn't snap to intended feature

I have been using the trim/ extend tool to connect service lateral lines to water mains, or so I thought. Upon further investigation, when zoomed in as far as possible, it turns out these two features ...
CatchE's user avatar
  • 3
2 votes
2 answers
104 views

Create 3D Cylinder in ArcGIS Pro

Is it possible to create a hollow 3D line feature in ArcGIS Pro? Something like a CAD "SOLIDEDIT" operation (I know next to nothing about CAD). I have a 3D Model of a large-diameter water ...
Keggering's user avatar
  • 1,121
0 votes
0 answers
26 views

QWater Model - Analysis Interpretation

I want to ask about QWater plugin function in QGIS output, how can I understand on what the p and H stands for? Also what does the negative and positive value indicates to? Currently I just create ...
Hazim's user avatar
  • 1
0 votes
1 answer
86 views

Least cost path based on flow direction

I need to find least cost path between two points inside a river polygon. The least cost path criteria is water flow direction, I need to follow the water flow to waste as little energy as possible. I ...
redhat's user avatar
  • 347
0 votes
0 answers
37 views

How to use water body data from EarthExplorer?

I've downloaded some data from EarthExplorer that should be the water body data for the area I'm mapping. The download comes with a DBF, SHP, and SHX file. Once I load them into QGIS though, all three ...
WillCTM's user avatar
1 vote
0 answers
64 views

Assign CRS for drone imagery

I am importing TIFF imagery from the Phantom 4 Multispectral drone which does not have predefined CRS. When I double click the layer and go into the source tab and select a CRS, it displays over the ...
Jas Singh's user avatar
0 votes
0 answers
96 views

Retrieving concentration values from Google Earth Engine

I am using a chlorophyll-a algorithm to retrieve chlorophyll-a and turbidity concentrations using different algorithms for a lake using Sentinel 2A (S2_SR). How can I determine the output ...
Jas Singh's user avatar
1 vote
0 answers
10 views

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 ...
cibalcazar's user avatar
1 vote
1 answer
72 views

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 ...
nicholaskr23's user avatar
0 votes
1 answer
113 views

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 ...
nicholaskr23's user avatar
1 vote
1 answer
206 views

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 ...
nicholaskr23's user avatar
0 votes
0 answers
100 views

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 ...
Rene's user avatar
  • 1
0 votes
1 answer
587 views

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 (...
nicholaskr23's user avatar
0 votes
0 answers
92 views

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 ...
Minh Vu Anh's user avatar
-1 votes
1 answer
383 views

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 ...
Jim Titus's user avatar
0 votes
0 answers
649 views

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; ...
Sander Van Beuningen's user avatar
0 votes
0 answers
68 views

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 ...
Anugraha Udas's user avatar
-1 votes
1 answer
57 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 ...
Need help please's user avatar
1 vote
0 answers
44 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 ...
Need help please's user avatar
0 votes
2 answers
42 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.
كمال جلال's user avatar
1 vote
0 answers
164 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 ...
Christopher Yap's user avatar
0 votes
1 answer
1k 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 ...
Mohamad's user avatar
  • 113
0 votes
1 answer
143 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 ...
Tariq Abbas's user avatar
7 votes
1 answer
351 views

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?...
Leo's user avatar
  • 87
0 votes
0 answers
67 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:...
shar's user avatar
  • 1
2 votes
0 answers
238 views

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 ...
Ali Ali's user avatar
  • 21
3 votes
1 answer
257 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 ...
neubert's user avatar
  • 370
1 vote
1 answer
895 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 ...
ess's user avatar
  • 91
1 vote
0 answers
248 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 ...
nichomeso's user avatar
  • 205
2 votes
1 answer
263 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&...
jserv's user avatar
  • 195
2 votes
3 answers
1k 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 ...
Unagi's user avatar
  • 39
0 votes
0 answers
211 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 ...
Scott Riley's user avatar
3 votes
1 answer
1k 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: ...
Stephan Büttig's user avatar
1 vote
1 answer
122 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 ...
Tariq Abbas's user avatar
0 votes
1 answer
312 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 ...
Tariq Abbas's user avatar
1 vote
0 answers
82 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 ...
Tariq Abbas's user avatar
1 vote
0 answers
197 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 ...
Mezobot93's user avatar
1 vote
0 answers
147 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 ...
aliaa osama's user avatar
3 votes
2 answers
3k 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 ...
Stephan Büttig's user avatar
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 ...
Stücke's user avatar
  • 539
0 votes
0 answers
60 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 ...
Irrigation_GIS's user avatar
2 votes
0 answers
1k 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 (...
sn1ks's user avatar
  • 3,022
1 vote
1 answer
754 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 ...
Pil Kwon's user avatar
  • 1,040