From c2c497544e005239411896632b592901e4fc475a Mon Sep 17 00:00:00 2001
From: Hsieh Chin Fan <typebrook@gmail.com>
Date: Fri, 28 Aug 2020 10:19:25 +0800
Subject: update

---
 tools/csv/csv2geojson | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100755 tools/csv/csv2geojson

(limited to 'tools/csv/csv2geojson')

diff --git a/tools/csv/csv2geojson b/tools/csv/csv2geojson
new file mode 100755
index 0000000..e742be6
--- /dev/null
+++ b/tools/csv/csv2geojson
@@ -0,0 +1,46 @@
+#! /bin/bash
+
+# -s to skip specify columns of longitude and latitude
+for i in "$@"
+do
+case $i in
+  -s)
+    lon_col=0; lat_col=1
+    shift;;
+
+  *)
+    csv=$i
+    shift;;
+esac
+done
+
+# if no -s option, just read from input
+if [ "$lon_col" != "0" ]; then
+  # show each field with index in csv
+  echo -------------- > /dev/tty
+  head -1 < $csv | tr ',' '\n' | nl > /dev/tty
+  echo -------------- > /dev/tty
+  echo > /dev/tty
+
+  # get index of lon/lat column
+  read -p "Number of longitude column: " lon_col
+  read -p "Number of latitude column: " lat_col
+fi
+
+(which dos2unix &>/dev/null && dos2unix <$csv || cat $csv) |\
+# move lon and lat to the first and second column
+awk -F',' -v lon_th=$lon_col -v lat_th=$lat_col '\
+  BEGIN{OFS=","}\
+  {printf $lon_th "," $lat_th; for (i=1; i<= NF; i++) if (i != lat_th && i != lon_th) printf "," $i; print ""}\
+  ' |\
+# change csv into array format, like [lon, lat, "field1", field2...]
+sed 's/[^,]*/"\0"/g; s/.*/[\0]/g' |\
+# wrap other fields as a json object, like [lon, lat, {...}]
+jq -s '.[0][2:] as $fields | .[1:][] | [.[0], .[1], ([$fields, .[2:]] | transpose | map({(.[0]): .[1]}) | add)]' |\
+# create array of geojson point features
+jq '{"type": "Feature",  "properties": .[2],  "geometry":{ "type": "Point",  "coordinates": [(.[0] | tonumber), (.[1] | tonumber)] } }' |\
+# wrap features as geojson format
+jq -s '{"type": "FeatureCollection", "features": .}' |\
+tee /tmp/geojson
+
+echo stored into /tmp/geojson > /dev/tty
-- 
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