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Geographic Information Systems : Recent Questions and Answers (Page 60)

Find answers to your questions about Geographic Information Systems or help others by answering their Geographic Information Systems questions.

Setting up CRS for Mars images taken by a satellite

I have a PDS image of the Valles Marineris taken by the Mars Orbiter Missions (MOM) Mars Colour Camera (MCC). I have to generate a depth map and I am...

Asked on 09/02/2021 by user7587298

1 answer

Creating a Bounding box on pgr_Dijkstra to make it faster

I have a problem with the Dijkstra algorithm in regards to the query speed.My current php script for the query is looking like this:$sql = "SELECT * FROM...

Asked on 09/02/2021

1 answer

Classifying land use in polygons using aerial imagery

I am trying to use the shapefile here: https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/HistoricLandfill&Mode=spatial to work out how much of the sites are covered in trees. I have managed to load...

Asked on 09/02/2021 by alice.fraser-mcdonald

1 answer

How to skip null images in Google Earth Engine?

I've called sentinel2 image collection but I don't know how can I skip null images instead of filter.neq(): code link: https://code.earthengine.google.com/b762152c33e6eddca96c2006e62eed54var s22 = ee.ImageCollection("COPERNICUS/S2").filterDate(start_date,end_date).filterBounds(table).filter(ee.Filter.lessThan('CLOUDY_PIXEL_PERCENTAGE',45)).filter(ee.Filter.neq('PRODUCT_ID','S2A_MSIL1C_20180518T071621_N0206_R006_T39SUR_20180518T093201'));...

Asked on 09/02/2021 by Johny Astine

0 answer

Google Earth Engine: Error for mapping expression function over feature collection

I'm having an issue when trying to create a function to map over a feature collection. I'm trying to create SST thresholds for several regions where over a certain SST...

Asked on 09/02/2021

1 answer

How to hide feature layer outside of boundary feature layer using ArcGIS JavaScript API?

I am developing JavaScript application. I have two feature layers one for features with point symbol and one for boundary with line symbol. I have added these two layers on...

Asked on 09/02/2021 by Tarni Baghel

1 answer

Arc Hydro: Assign Stream Slope Producing _Mostly_ Correct Elevation

I'm pretty new to the Arc Hydro Toolbox. I used assign stream slope in the Arc Hydro toolbox. It produced a mostly correct to and from elevation. However, if...

Asked on 09/02/2021 by wingingit

1 answer

Shapefile in leaflet shifted North 0.25°

I have the following problem: I render a bunch of weather maps as PNG overlays with grads and then reproject them from EPSG:4326 to EPSG:3857 to display them in leaflet...

Asked on 09/02/2021 by Stefan Gofferje

1 answer

How to bind to coordinates , in sld GeoServer?

I have coordinates and there is an image (link to png image), I need to bind it to the coordinates (onlineresource tag) in the GeoServer. An example of how to...

Asked on 09/01/2021 by Develop Qurtino

1 answer

Converting geometry of elements of table to move it from one srid system to another

I have a table containing a column geom loaded from a shape file which was defined in lambert II system (27582), but when I loaded it I specified that I...

Asked on 09/01/2021

2 answer

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