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Questions tagged [shadow]

A shadow is an area where direct light from a light source cannot reach due to obstruction by an object.

9
votes
1answer
48 views

Using DEM to find permanently shadowed craters

I'm using ArcGIS Pro to try to identify permanently shadowed craters on the North Pole of the Moon. Pictured below is a screenshot of the DEM I'm using which was collected from the laser altimeter on ...
5
votes
1answer
187 views

Calculating shadow of trees with DEM in QGIS?

I have a DEM with a good precision (0,5 x 0,5 m/pix LiDAR) and I´m looking for the way to obtain a raster (or shapefile) with the shadow of the trees located in that place for a whole day (ideally ...
0
votes
0answers
57 views

How to detect cloud's shadows with Sentinel2/SentinelHub?

I'm trying to detect clouds and their shadows on Sentinel2 images with SentinelHub service. For clouds detection, SentinelHub team has developed a good tool but I would like to detect cloud's shadow ...
0
votes
0answers
50 views

Producing cloud and cloud shadow mask from Sentinel images?

What is a good tool to produce (cloud) and cloud shadow masks? I tried fmask tool and Sentinel SNAP but while those can produce reasonable cloud masks, cloud shadow results are poor. I need to ...
1
vote
1answer
158 views

Solar radiation analysis in ArcGIS (shade)?

I was wondering whether the Area solar radiation tool in ArcGIS takes into account the effect of shadow by the topographic surrounding terrain. Besides, is there a way to undo this effect, so I can ...
0
votes
0answers
487 views

GEE Landsat SR year composite // mask cloud / shadow out w/ other method than quality pixel

Has anyone found a good solution to mask out cloud/shadow cover not using quality assessesment pixels or combining it with something else? I am trying to generate cloud/shadow free composite for a ...
2
votes
1answer
117 views

Building polygon shadows in PostGIS

We are working on a project where we want to make a route planner that takes into account the amount of sun on the route. The goal would be to calculate 'solar car' friendly routes. We are using ...
1
vote
1answer
66 views

Know the shadows of a house before building it

Imagine a house/building, seen from outside, at sunrise. As the the sun moves in the horizon, a) the shadow of the house is displaced/deformed, and b) some faces of the house have more/less sunlight ...
4
votes
1answer
182 views

How to create hillshade models every hour for a zone with GDAL

I´m trying to calculate the hillshade models from a zone for every hour during one month. I´m using the GDAL, gdaldem hillshade (I don´t know if there is another tool/library). The problem is how to ...
4
votes
3answers
588 views

Extract shadows from a DEM using GrassGIS's r.sunmask command

I'm trying to use GrassGIS to extract the shadow from a DEM (elevation data). The DEM I'm using shows Geneva (plus a part of the Alps mountains), and was captured by the SRTM. The elevation data was ...
1
vote
0answers
212 views

Sun Shadow Volume Tool ESRI [closed]

At my Sun Shadow Volume analysis I have the problem that not all of the shadow volumes reach the originating feature. I get a field named "HUGS_FEATR" where it is indicated if the shadow hugs the ...
0
votes
1answer
839 views

Shadow impact of building on certain area [duplicate]

I have done some research but was not able to find a solution to my task! What do I want: Pretty simple - I have a building and I want to know how its shadow is influencing a certain site at ...
1
vote
0answers
131 views

Solar Potential roof-top analysis using GIS and Remote Sensing [closed]

3D Building models were generated by using Google Sketchup Pro and Google Earth. Then shadow casted 2D orthographic raster models were exported as TIFF or JPEG format. For further analysis with ...
4
votes
2answers
2k views

Shadow mapping from raster data [closed]

I was wondering if anyone knows of a plugin, extension, process, etc. for mapping shadow locations based on date/time using raster data? I have searched and what I have been able to find all seems to ...
1
vote
0answers
123 views

How to calculate receiving shadow?

Using the Cesium library, I want to find shadows that objects fall onto each other. With Cesium, I can create shadows of objects, but I have no idea how to get the shadows that fall on objects. How ...
0
votes
0answers
80 views

Calculate shadows based on elevation data

Is anybody able to recommend a process that can be used to calculate the hours of sun that a given location will receive, taking into account time of year and shade from local geography. I have not ...
2
votes
1answer
326 views

Creating inset shadow for river polygon in ArcGIS Desktop?

I'm trying to accomplish what the image of the two ponds shows as "inset" shading. They called this Bevel effect, which I think was down in Adobe Illustrator. I'm using ArcMap 10.3 without 3D Analyst. ...
0
votes
1answer
150 views

Cloud and cloud shadow masking for old LANDSAT and ASTER images in GRASS

I am trying to remove cloud and cloud shadows for Landsat 4-5 ASTER images in GRASS GIS. I have knowledge that detecting cloud and cloud shadow pixels which is >(255*0.2), but I cannot figure out ...
3
votes
0answers
225 views

r.sun from QGIS toolbox doesn't give realistic value about the hours of insolation

I have a problem with the GRASS module r.sun when I run it in QGIS. I would calculate the hours of insolation in a specific site during a specific day. When I ran the algorithm "r.sun" from GRASS, it ...
8
votes
0answers
195 views

Speed optimization of shadow computation with grass gis r.sun [closed]

I am trying to optimize the speed of r.sun to compute shadowed area on a DTM at 1m resolution. My current area is 3.39 km² but my final area will be 450 km². The r.sun wiki say that pre-computing ...
2
votes
1answer
1k views

Multipatch footprint of Sun Shadow Volume in ArcScene (removal of below ground shadows)

I am new to using ArcScene and encountered a problem in my analysis. I want to calculate shadows in the city center of Utrecht on different times and days. Subsequently I want to transform these ...
1
vote
1answer
2k views

Removing Shadows from Aerial Imagery in ArcGIS

I am creating an automatic change detection tool in Python for ArcGIS 10.2 using aerial imagery. The tool works but it also detects shadow change. I have been able to create a classified raster of ...
1
vote
1answer
565 views

How to create shadows of buildings with r.sunmask?

I need to create image-raster with shadow of relief and shadow of buildings in one. I know how to create shadow of relief but how i can create shadow of buildings with r.sunmask? I dont know how from ...
5
votes
1answer
785 views

Create shadow of building in ArcScene

I want to create shadow of a building at different time in ArcScene but I am a beginner of using ArcScene so I am not familiar with this. I am using ArcGIS 10.2.2 version. I tried to use "sun shadow ...
10
votes
3answers
1k views

Handling mountain shadows when classifying Landsat 8

I'm trying to classify some area in northern Mongolia using Landsat 8 satellite images from 2013. Since the recordings were made in winter, the sun is very low at the acquisition time. Therefore there ...
5
votes
1answer
481 views

Do OrthoRectified Images have shadow?

Orthorectified images have removed relief displacements and tilt displacements. Since the assumption of orthorectification is to keep the light source at infinite distance so that the light rays are ...
19
votes
3answers
4k views

Producing building shadows using ArcGIS Desktop?

How would you generate building shadows from building footprints? I have attribute values for the heights of buildings. So would preferably like to have the shadows' sizes vary based on that. The best ...