coordinates

问题 I want to add an electronic signature to a pdf. i am using signature pad library for capturing signature and sticker view for moving, scaling and rotating image StickerView. I am rendering the PDF in android using PDFView library to render PDF. i am using PDFbox by tomroush to manipulate pdf in android. i want to add image of signature to the pdf. but there is problem in mapping android view coordinates to pdf box coordinates. i am attaching code for what i have tried //loading pdf pdfView

问题 I can do this on paper easily enough but have a bit of a mental block in getting this into a language (I'd take any answer but Java probably easiest). I have two sets of points Point A (xA, yA) and Point B (xB, yB). Knowing this, and assuming that these two create a straight line graph I need to be able write a function that will give me xC given that I would know yC (and, obviously that the new point is on the same line). All help appreciated :) Kind Regards 回答1: (yB-yA)/(xB-xA) = (yC - yA)

问题 Let's say I have a small area mapped out using local planar coordinates in meters. e.g. A rectangular warehouse that's 300m x 450m. I use some GPS device to find the WGS 84 lat/lon of one corner of the warehouse. How can I project my plane coordinates onto the WGS 84 geoid to find the lat/lon values for the 3 other corners of the warehouse? I understand this is a complicated problem since values vary on different parts of the earth. Do I need to deal with finding some local coordinate system

问题 Let's say I have a small area mapped out using local planar coordinates in meters. e.g. A rectangular warehouse that's 300m x 450m. I use some GPS device to find the WGS 84 lat/lon of one corner of the warehouse. How can I project my plane coordinates onto the WGS 84 geoid to find the lat/lon values for the 3 other corners of the warehouse? I understand this is a complicated problem since values vary on different parts of the earth. Do I need to deal with finding some local coordinate system

问题 I'm using a KML file to extract coordinates and insert them in a multi-dimensional array. At first I'm trying to output only the coordinates on the page - and it doesn't seem to be working Here is the code I've tried so far: <?php $url = "myKML.kml"; $contents = file_get_contents($url); $xml = new SimpleXMLElement($contents); $value = (string)$xml->Document->Placemark->Point->coordinates; $coords = array(); foreach($value as $coord) { $args = explode(",", $value); $coords[] = array($args[0],

问题 I am getting coordinates - lat/lon and I want to check if these coordinates are in the continental United States or not. Is there a easy way to do it in C#? I can convert the coordinates into MGRS or UTM. Thanks! 回答1: Oh wow, they have it just for you: http://econym.org.uk/gmap/states.xml All the coords of the US states! Build up a polygon and apply any polygon-contains-point algorithm. The classic algorithm is ray-casting, and its even pretty simple. Let me know if you have any trouble with

问题 I am getting coordinates - lat/lon and I want to check if these coordinates are in the continental United States or not. Is there a easy way to do it in C#? I can convert the coordinates into MGRS or UTM. Thanks! 回答1: Oh wow, they have it just for you: http://econym.org.uk/gmap/states.xml All the coords of the US states! Build up a polygon and apply any polygon-contains-point algorithm. The classic algorithm is ray-casting, and its even pretty simple. Let me know if you have any trouble with

问题 What is the simplest way to calculate a new latitude point by going SOUTH x number of meters from a given latitude? For example, the Eiffel Tower is at 48.8582 latitude and 2.2940 longitude . I have a circle around the Tower with a radius of 171 meters. I want to position an InfoBox just beneath the circle. So here is my circle: var circle = new google.maps.Circle({ map: map, fillColor: 'red', fillOpacity: 0.2, strokeWeight: 1, center: new google.maps.LatLng(48.8582, 2.2940), radius: 171 });

问题 I have linestring which represent a driving journey down some streets. But I want to actually represent a cyclists journey, which is offset from the line i.e. they travel near the kerb of the road. I'm struggling with how to do it. I've made a reproducible piece of R code to illustrate. ## Let's say I have a route along some streets. library(ggplot2) ## It can be described by this data <- data.frame(x = c(1,3,10,5,0,5), y = c(1,3,1,0,5,7), label = c('a', 'b', 'c', 'd', 'e', 'f')) ##

问题 I'm using google maps in my application, and I have a webserver with a databse filled with lat/lon values. I want to mark them on the map, but I also want to cluster them together if they are within a certain pixel-distance of eachother. I figure if I retrieve all my points from the database, I should be able to do something like this (pseudocode): clusters[]; while(count(points)) { cluster[]; point = points.pop(); boundingbox = pixelsToBB(point, pixeldistance, zoomlevel); query = "select *