Convert Arcinfo Ascii Grid file to JSON

asc2json.ps1

# asc2json
# Convert Arcinfo Ascii Grid file to JSON
# RegEx replace:
#   - strip leading whitespace
#   - strip line not beginning with a number
#   - add opening `[` to beginning of line
#   - space to comma
#   - end of line to `],`
#   - strip empty list `[],` 

$infile = $args[0]
$outfile = (Get-Item $infile).Basename + '.json'

(Get-Content $infile) | 
Foreach-Object {$_ -replace "^\s*", ""} | 
Foreach-Object {$_ -replace "^\D.*", ""} | 
Foreach-Object {$_ -replace "^", "["} | 
Foreach-Object {$_ -replace "\ ", ","} | 
Foreach-Object {$_ -replace "$", "],"} | 
Foreach-Object {$_ -replace "^\[\],$", ""} | 
Set-Content $outfile

# Remove empty lines
(Get-Content $outfile) | 
? {$_.trim() -ne "" } | 
Set-Content $outfile

Sparked by RaumZeit/MarchingSquares.js#9