Extracting the closest Point to a Line within a Polygon using ArcGIS for Desktop

How can I find closest point on a polygon from a point? The line segment corresponds to 0≤t≤1, so if t≤0, the closest point to (xp,yp) is (xA,yA); if t≥1 the closest point to (xp,yp) is (xB,yB); otherwise, the closest point to (xp,yp) is (x(t),y(t)).  What is proximity analysis in ArcGIS? Proximity analysis is one

CartoDB SQL string as integer

How to convert string to int in SQL? SELECT CAST(‘789’ AS INT); SELECT CAST(CAST (‘12345.67’ AS NUMERIC) AS INT); SELECT CAST(CAST (‘12345.6789’ AS NUMERIC(19,4)) AS INT); SELECT CONVERT(INT, ‘123’); How to convert text to number in SQL? Related SQL Functions TO_NUMBER converts a string to a number of data type NUMERIC. TO_CHAR performs the reverse

Qgis convert string to date

How do I convert a string to a date? Convert a String to a datetime object using datetime.strptime() The datetime.strptime() method returns a datetime object that matches the date_string parsed by the format. Both arguments are required and must be strings.  How do I convert a text field to a date field? Convert text dates

Comparing Heatmaps over time

How do you compare two heatmaps? A comparison of two heatmaps is essentially just a comparison of two histograms, or distributions. Thus an alternative to our visual approach is to use statistical tools that compute the difference between two distributions. How do you evaluate a heat map? How do I read a heatmap? You can

Adding coordinates to polygon layer to sort polygons from north to south in QGIS?

How do I add coordinates to a polygon in Qgis? Quote from video: Create a new field with decimal field type forex type in x centroid dollar sign geometry. And look for the brackets. And you can do it again for y. And that's it. How do I add a centroid in Qgis? From the

Visualizing proximity to nearest park in QGIS