Use https links, add to dependencies in mapolution README.

README.md

@@ -4,9 +4,9 @@
 This repository contains a mixed bunch of more or less useful examples of how
 to work with the Osmium library.
 
-You have to set up [Libosmium](http://osmcode.org/libosmium) first.
+You have to set up [Libosmium](https://osmcode.org/libosmium) first.
 
-[![Build Status](https://secure.travis-ci.org/osmcode/osmium-contrib.svg)](http://travis-ci.org/osmcode/osmium-contrib)
+[![Build Status](https://secure.travis-ci.org/osmcode/osmium-contrib.svg)](https://travis-ci.org/osmcode/osmium-contrib)
 
 
 ## Building

dense_tiles/README.md

@@ -9,7 +9,7 @@ left tile in an 8x8 tile block will be output.
 
 ## Prerequisites
 
-You'll need [Libosmium](http://osmcode.org/libosmium) and its dependencies
+You'll need [Libosmium](https://osmcode.org/libosmium) and its dependencies
 installed first.
 
 

export_to_wkt/README.md

@@ -6,7 +6,7 @@ Write all node, way, and area geometries out in WKT format.
 
 ## Prerequisites
 
-You'll need [Libosmium](http://osmcode.org/libosmium) and its dependencies
+You'll need [Libosmium](https://osmcode.org/libosmium) and its dependencies
 installed first.
 
 

mapolution/README.md

@@ -7,14 +7,17 @@ Show evolution of OSM map.
 
 You'll need:
 
-* [Libosmium](http://osmcode.org/libosmium) and its dependencies.
-* [GDAL](http://gdal.org/) library, more specifically the `gdal_rasterize`
+* [Libosmium](https://osmcode.org/libosmium) and its dependencies.
+* [GDAL](https://gdal.org/) library, more specifically the `gdal_rasterize`
   command. (On Debian/Ubuntu install `libgdal-dev` and `gdal-bin` packages.)
 * `boost_filesystem` and `boost_program_options`
-  (http://boost.org/) version 1.48 or later.
-  (On Debian/Ubuntu install `libboost-filesystem-dev`,
+  (https://boost.org/) version 1.48 or later.
+  (On Debian/Ubuntu install `libboost-filesystem-dev`
   and `libboost-program-options-dev` packages.)
-* gifsicle (On Debian/Ubuntu install `gifsicle`.
+* gifsicle (On Debian/Ubuntu install `gifsicle`).
+* [Imagemagick](https://www.imagemagick.org/)
+  (On Debian/Ubuntu install `imagemagick`).
+* bc (On Debian/Ubuntu install `bc`).
 
 
 ## Building

node_density/README.md

@@ -6,14 +6,14 @@ Visualize the node density in a given OSM file.
 
 ## Prerequisites
 
-You'll need [Libosmium](http://osmcode.org/libosmium) and its dependencies
+You'll need [Libosmium](https://osmcode.org/libosmium) and its dependencies
 installed first.
 
 You'll need the following libraries:
 
-[GDAL](http://www.gdal.org/) - Debian/Ubuntu: libgdal-dev, gdal-bin
+[GDAL](https://www.gdal.org/) - Debian/Ubuntu: libgdal-dev, gdal-bin
 
-[Proj](http://trac.osgeo.org/proj/) - Debian/Ubuntu: libproj-dev
+[Proj](https://proj4.org/) - Debian/Ubuntu: libproj-dev
 
 
 ## Building
@@ -54,7 +54,7 @@ the default name `out.tif`.
 
 ### With QGIS
 
-Run [QGIS](http://qgis.org/) and open the output file with it, either through
+Run [QGIS](https://qgis.org/) and open the output file with it, either through
 the "Layer -> Add Raster Layer.." menu or by dragging the file onto the QGIS
 window. Open the "Layer Properties" dialogue, choose the "Style" tab and change
 the "Min" and "Max" values to "0" and "1000", respectively. You should see the

node_density/main.cpp

@@ -106,7 +106,7 @@ class NodeDensityHandler : public osmium::handler::Handler {
         }
 
         dataset->SetMetadataItem("TIFFTAG_IMAGEDESCRIPTION", "OpenStreetMap node density");
-        dataset->SetMetadataItem("TIFFTAG_COPYRIGHT", "Copyright OpenStreetMap contributors (http://www.openstreetmap.org/copyright), License: CC-BY-SA (http://creativecommons.org/licenses/by-sa/2.0/)");
+        dataset->SetMetadataItem("TIFFTAG_COPYRIGHT", "Copyright OpenStreetMap contributors (https://www.openstreetmap.org/copyright), License: CC-BY-SA (https://creativecommons.org/licenses/by-sa/2.0/)");
         dataset->SetMetadataItem("TIFFTAG_SOFTWARE", "node_density");
 
         double geo_transform[6] = {m_bottom_left.x, 1/m_factor_x, 0, m_top_right.y, 0, 1/m_factor_y};