Questions tagged [mathematics]
The abstract study of topics encompassing quantity, structure, space, change, and other properties
122 questions
3 votes
2 answers
73 views
Extracting enclosed raster objects in ArcGIS Pro
I am working with raster data in ArcGIS Pro and am seeking a workflow to extract raster objects enclosed by a value (see image below). I have two input rasters, both binary. I would like to use Region ...
- 31
-1 votes
2 answers
117 views
Finding radius of horizon
If B (observer height, 40,000-feet) and C (distance from observer to horizon, 245-miles) are known then how do I solve for Z (radius of the horizon)? The angle of B-C is 86.46-degrees so the angle of ...
- 13
1 vote
1 answer
140 views
What is the step-by-step process to solve Angle = ArcCos(R / R+h)?
I'm attempting to calculate the angle to the horizon from various heights to determine how much of the Earth's curve should actually be observable; however, every example and website I've seen that ...
- 13
0 votes
0 answers
195 views
Bounding box intersection when crossing date-line and meridian
First of all, I check for general intersections: public bool CheckOverlap(BoundingBox boundingBox) { if (this.UpperRight.Longitude < boundingBox.LowerLeft.Longitude) return ...
0 votes
0 answers
20 views
Map location of unknown point coordinates with two known coordinates and distances between them [duplicate]
I have a problem where I need to find the coordinates of a point which is the intersecting point of two circles. I found a similar question on stackoverflow. I understood to some extent, but not able ...
- 1
2 votes
1 answer
292 views
Calculate the new x and y coordinate of the extent after rotating the map in MapViewer ArcGIS Online
I need to add a symbol to the lower left corner of the map, so every time I rotate the map, I need to calculate the new coordinate of this symbol (which is the new map extent of the lower left corner)....
- 41
0 votes
0 answers
53 views
Adjusting GPS location of an object (sled) pulled at a set distance as it moves 3D
A bit of an odd question. We're pulling a sled behind a truck which carries an instrument. We've had to mount the GPS on the truck and are pulling the instrument back and forth in lines in a field. We ...
- 119
2 votes
2 answers
520 views
Create a longer line segment from a shorter one?
I do not believe my math is incorrect. This is seems like it could be a projection issue. I start with the following two coordinates ( lon, lat in degrees ) a: [37.821055535000085, -46.84417083099993] ...
- 123
2 votes
1 answer
214 views
Multiply and Divide functions do not have correct output in Google Earth Engine
I am trying to calculate standard deviation (observed - mean)/(mean)*100 but I noticed the part where you ".divide(longTermMean)", the math results results are incorrect. I tested out ...
- 33
2 votes
1 answer
892 views
Calculate distance between location and way segment
For my question I have prepared a JsFiddle demo which works well and is fun to play around with: My question is neither about JavaScript nor OpenStreetMap though. It is about mathematics. When you ...
- 257
1 vote
0 answers
34 views
Reconstruction of a geometric graph: link only vertices with no vertices in-between [closed]
I'm a mathematician who got lost here looking for the name of a graph construction. Sorry if my question is silly/out-of-topic, but it seemed like a good place to ask. I hope my notations are going to ...
- 111
0 votes
0 answers
137 views
Calculate point line distance for a geolocation with altitude
I'm trying to calculate the coordinates (Latitude, Longitude, Altitude) of a point on a line at the minimum distance with another point. I was able to calculate the distance using the formula here: ...
0 votes
1 answer
120 views
Why does the calculation for y-value (when converting from lat/long to a Mercator x,y) involve the width of the map?
I have been looking into converting latitude and longitude into x and y coordinates. This link (first answer) provides a perfect answer for me, but I am wondering why it works. I have figured out why ...
2 votes
1 answer
392 views
Calculating average Azimuth of route
I would like to get an average azimuth of a route (like slope in linear regression). I tried using linear regression to calculate a slope and convert that slope to degrees (azimuth), but I got the ...
- 151
1 vote
1 answer
815 views
Calculate GPS elevation angle (Python)
I have two GPS points (Latitude, Longitude, Altitude) the distance between the two points is a maximum of 50 kilometers. How can I calculate the elevation angle? (I want to implement the whole thing ...
- 11