Questions tagged [water]
The water tag has no usage guidance.
43
questions
0
votes
0
answers
13
views
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 ...
- 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 ...
- 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 ...
- 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 ...
- 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 ...
- 1
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 ...
- 41
0
votes
0
answers
98
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 ...
- 41
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 ...
- 11
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 ...
- 69
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 ...
- 69
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 ...
- 69
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 ...
- 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 (...
- 69
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 ...
-1
votes
1
answer
384
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 ...
- 13