update vignettes

Author: ernestguevarra

vignettes/washdata.Rmd

@@ -235,7 +235,7 @@ It is very likely that the spatial organisation of the various cities to be samp
 [^13]: Based on previous work done by Valid International on application of LQAS on reporting water and sanitation indicators recommended by the Joint Monitoring Programme (JMP)
 [^14]: Some modifications to these steps may need to be done on a country by country basis particularly with regard to how the groupings of the spatial units are organised and sub-divided. Otherwise, the general approach is the same on any setting.
 [^15]: There are many formats for map files. In general, the most common and most accessible formats are keyhole markup language (KML) files which are the standard output format produced by Google Maps/Google Earth and ESRI Shapefiles.
-[^16]: These days,there are various available online repositories of map data files for most countries including cities. We most commonly use the repository maintained by Robert Hijmans at https://www.gadm.org and the one maintained by UN OCHA called Humanitarian Data Exchange (https://data.humdata.org). Organisations such as the World Food Programme also maintain their own repositories but most of their maps are also made available through the Humanitarian Data Exchange.
+[^16]: These days,there are various available online repositories of map data files for most countries including cities. We most commonly use the repository maintained by Robert Hijmans at https://gadm.org and the one maintained by UN OCHA called Humanitarian Data Exchange (https://data.humdata.org). Organisations such as the World Food Programme also maintain their own repositories but most of their maps are also made available through the Humanitarian Data Exchange.
 [^17]: The best openly available sources for this map data are from the WorldPop project (<https://www.worldpop.org>) and the Global Rural-Urban Mapping Project or GRUMP (<https://sedac.ciesin.columbia.edu/data/collection/grump-v1>).
 [^18]: For most cities,this can be available from OpenStreetMap or OSM (<https://www.openstreetmap.org>). Google Earth can also be used to view satellite imagery of the city.