problem exporting data with ogr2ogr

i wanted to export a geojson file from my table „GeoData4326“ (with quotes) postgis postgres database with ogr2ogr

ogr2ogr -f „GeoJSON“ export.json PG:“host=localhost dbname=mydb user=myuser password=12341234 „\“GeoData4326\““

i got the following error:

ERROR 1: No field definitions found for ‚“GeoData4326″‚, is it a table?
FAILURE: Couldn’t fetch requested layer ‚“GeoData4326″‚!

my workaround is: create a view to this table without quotes on the name:

create or replace view GeoData4326 as SELECT * FROM „GeoData4326“;

now the export should work.


sqlite on raspberrypi

not a big deal with that
install the sqlite3
sudo apt-get install sqlite3

now you can read db-sqlite-files. here are some example and useful SELECT-statements

# open db
# list all tables
SELECT name FROM sqlite_master WHERE type=’table‘;
# list columns
SELECT sql FROM sqlite_master WHERE tbl_name = ‚xxx‘ AND type = ‚table‘;
# convert datetime
select strftime(‚%Y-%m-%d‘, published_at / 1000, ‚unixepoch‘), title from posts order by published_at;
# exit

spotify on raspberry pi

system configuration

enable ipv6
first, check if its loaded

sudo sysctl -a|grep ipv6

if not load it

sudo modprobe ipv6

and also load it on every reboot with:

echo ipv6|sudo tee -a /etc/modules

install mopidy

main documentation from here

if you have another running instance of mpd/mpc shut it down – because mopidy has its own mpd/mpc

1. Add the archive’s GPG key:
wget -q -O – | sudo apt-key add –
2. Add the following to /etc/apt/sources.list, or if you have the directory /etc/apt/sources.list.d/, add it to a file called mopidy.list in that directory:
# Mopidy APT archive
deb stable main contrib non-free
deb-src stable main contrib non-free
For the lazy, you can simply run the following command to create /etc/apt/sources.list.d/mopidy.list:
sudo wget -q -O /etc/apt/sources.list.d/mopidy.list
3. Install Mopidy and all dependencies:
sudo apt-get update
sudo apt-get install mopidy

about 25MB disk space will be used

4. now you can choose, if you want to run mopidy as a service (in the background) or only for testing as a user instance. (see also here)
running it as a user instance – first disable the service and shut it down
sudo update-rc.d mopidy disable
sudo service mopidy stop
start mopidy with

to configure it as a service first check if its running
ps aux | grep ‚mopidy‘
sudo service mopidy status

or start it
sudo service mopidy start

service commands
sudo service mopidy start
sudo service mopidy stop
sudo service mopidy restart
sudo service mopidy status

5. configuration
the config-file contains only changes to the default config. check your config with
mopidy config
sudo mopidyctl config

nano ~/.config/mopidy/mopidy.conf

sudo nano /etc/mopidy/mopidy.conf

sample-config for the http-extension
enabled = true
hostname = ::
port = 8081
WARNING – i had problems with the hostname set to the local ip address. my spotify playlists were missing after installing the http-client.
sample for local
enabled = true
data_dir = /var/lib/mopidy/local
media_dir = /data/music
playlists_dir = /data/radio
WARNING – i had problems with my m3u radio files/playlists. after putting them into a seperate folder outside of my music folder they were loaded successfully.
enabled = true
username = 1234567890
password = abcdefghijklm12345
bitrate = 320
here no warnings – use bitrate to encrease your quality
6. add-ons/extensions

add the nice http-extension MusicBox just do
pip install Mopidy-MusicBox-Webclient

7. log-file


other configurations for mopidy

config default Radio stations – just edit the following file


or - on musicbox

Convert iTunes-playlists to spotify!/article/Convert-Playlists-to-Spotify!/playlist/1425111848/104536359

postgresql with OSM on raspberryPI

follow these instruction (german) to install all you need for your own osm-server

install postgresql

first update

  sudo apt-get update
then install the package; about 21MB additional space will be used
  sudo apt-get install postgresql
after that the server should report
  [ ok ] Starting PostgreSQL 9.1 database server: main.
here are some steps to configure the server
install tools for osm
install imposm git postgis and postgresql-9.1-postgis
  sudo apt-get install postgis imposm git postgresql-9.1-postgisnow create a source directory and download osm data
  mkdir ~/src
  cd ~/src && wget the following tool, needed later
cd ~/src && git clone


run the following scritp as postgres-user, so first create a sh-file
  set -xe
  createuser –no-superuser –no-createrole –createdb osm
  createdb -E UTF8 -O osm osm
  createlang plpgsql osm
  psql -d osm -f /usr/share/postgresql/9.1/contrib/postgis-1.5/postgis.sql
  psql -d osm -f /usr/share/postgresql/9.1/contrib/postgis-1.5/spatial_ref_sys.sql
  psql -d osm -f /usr/share/python-imposm/900913.sql
  echo „ALTER TABLE geometry_columns OWNER TO osm; ALTER TABLE spatial_ref_sys OWNER TO osm;“ |psql -d osm
  echo „ALTER USER osm WITH PASSWORD ‚osm‘;“ |psql -d osm
  set +x
then login as postgres
  sudo su postgres
  sh ./

now add the following row to your postgre config and restart postgre
  sudo nano /etc/postgresql/9.1/main/pg_hba.conf
  host osm osm md5
  sudo /etc/init.d/postgresql restart

to import your first data use (more infos here)
imposm –-read –-write –-optimize -h localhost -p 5432 -d osm -m ~/src/osm-bright/ ~/src/slovenia-latest.osm.pbf
this will need quite a time – in my case
  imposm took 2 h 40m 44s

in the mean time you can check your database for new created tables after the message ## dropping/creating tables

in psql you can view your tables with (\connect osm;)

get the version of postgis

SELECT PostGIS_full_version();



POSTGIS=“1.5.3″ GEOS=“3.3.3-CAPI-1.7.4″ PROJ=“Rel. 4.7.1, 23 September 2009″ LIBXML=“2.8.0″ USE_STATS

(1 row)

  SELECT table_name FROM information_schema.tables WHERE table_schema = ‚public‘;


get column names from a table
  SELECT column_name FROM information_schema.columns WHERE table_name=’osm_new_roads‘;


and easy to find different types
  SELECT type, COUNT(*)  FROM osm_new_roads GROUP BY type ORDER BY type;

      type      | count
 bridleway      |     1
 cycleway       |    38
 footway        |   855
 living_street  |    27
 motorway       |   171
 motorway_link  |   247
 path           |   318
 pedestrian     |   139
 primary        |   283
 primary_link   |    26
 rail           |   128
 residential    |  2683
 road           |     5
 secondary      |   581
 secondary_link |    12
 service        |   593
 steps          |    60
 tertiary       |   888
 tertiary_link  |     2
 track          |  1820
 trunk          |    47
 trunk_link     |    47
 unclassified   |  1397
(23 rows)

after the import finished turn your *new* tables to operational tables – WARNING old data will be lost!
  imposm –deploy-production-tables -d osm

lets create tiles

go to the folder ~/src/osm-bright and rename

edit the config file
config[„importer“] = „imposm“
config[„postgis“][„host“]     = „localhost“
config[„postgis“][„port“]     = „5432“
config[„postgis“][„dbname“]   = „osm“
config[„postgis“][„user“]     = „osm“
config[„postgis“][„password“] = „osm“
download additional files to ~/src/osm-bright (coastline has ~310MB, shoreline ~45MB, 10m-land 5MB)


create this dir
  mkdir ~/Documents/MapBox/project


get server version
  select version();
PostgreSQL 9.1.14 on armv7l-unknown-linux-gnueabihf, compiled by gcc (Debian 4.6.3-14+rpi1) 4.6.3, 32-bit
drop a database
  CREATE TABLE account(
    user_id serial PRIMARY KEY,
    username VARCHAR (50) UNIQUE NOT NULL,
    password VARCHAR (50) NOT NULL,
    email VARCHAR (355) UNIQUE NOT NULL,
    created_on TIMESTAMP NOT NULL,
    last_login TIMESTAMP
as you see, squences, keys and uniques will be generated automatically
drop table also dropps all autogenerated objects
get tablenames
  SELECT table_name FROM information_schema.tables WHERE table_schema = ‚public‘;useful documentation to access postgres from external device (eg qgis…)
important commands/files for postgre
config file
  sudo nano /etc/postgresql/9.1/main/pg_hba.conf
restart server
  sudo /etc/init.d/postgresql restart
enter server with psql
  psql -U postgres
exit with CTRL-D
show data align after the query

manual installation of postGIS

download from
sudo apt-get install libpq-dev libproj-dev postgresql-server-dev-9.1
install geos and gdal – see
download source
sudo make install
test it with
geos-config –version
gdal-config –version
then update apt-get
sudo ldconfig
download source for postGIS and

./configure –with-topology –with-raster
sudo make install
restart postgresql
sudo service postgresql restart

use this documentation to install postGIS to postgresql

raspberry pi as cd ripper

it’s very easy! i used this tutorial
install abcde (A Better CD Encoder), flac (for the „free lossless audio codec„) and eject to eject to cd.

  sudo apt-get install abcde flac eject
test the eject program to open your cd/dvd-drive


now copy the original config-file from abcde to a temp-folder and replace the original with the following commands. for your system you have just to modify the path where your flac-files should be stored (edit OUTPUTDIR=/media/usb/cd-rip).

LAMEOPTS=‘–preset extreme‘
FLACOPTS=“-f –best“

now try to encode some tracks of your cd, eg track 1, 2, 4
  sudo abcde 1-2 4

to convert to mp3 also install lame codec and id3 and id3c2
  sudo apt-get install lame id3 id3v2

now start to rip to flac and mp3 in one step (eg only track 1, 2, 4)
  sudo abcde -o „flac“,“mp3″ 1-2 4

next step is to automate the ripping task

create a new file

  sudo nano /usr/local/sbin/

Now the few lines of code
echo „$(date)“ >> $LOGFILE

# Wait for lock on /var/lock/.audio-cd-rip.lock (fd 200) for two hours
flock -x -w 7200 200 || exit 1

abcde 2>&1 >> $LOGFILE
if [[ $rc != 0 ]] ; then
exit $rc
) 200>/var/lock/.audio-cd-rip.lock
Mark the script executable.
  sudo chmod +x /usr/local/sbin/
Now we create a udev rule that runs this script. A udev rule lets the udev service call our script it the conditions of the rule match.
  sudo nano /etc/udev/rules.d/99-cd-audio-processing.rules
Insert one single line:
SUBSYSTEM==“block“, KERNEL==“sr0″, ACTION==“change“, RUN+=“/usr/local/sbin/ &“
This says, that the script shall run when a CD with at least one audio track is inserted in block device sr0 (which is usually your first CDROM/DVD/WHATEVER-Drive). The script will run in background (you see the ‘&’?). Now reload udev rules
  sudo udevadm control –reload

due to bugs in the OS you have to make the following work-around to „active“ the cd-drive

  sudo crontab -eAdd this line at the end
  */1 * * * * /bin/touch /dev/sr0

but the cd-drive always opens and closes – so that’s not a good workaround 😦

ghost on raspberry pi

first install node.js. use my tutorial or another

then download the latest version of ghost and unzip the file (info from here)

  unzip -d ghost [Name-of-Ghost-zip].zip

then execute the following commands

  cd ghost/
  sudo npm install –production

  cp config.example.js config.js

then edit the config.js file:

in the development-section and in the production-section edit the url to your IP/DOMAIN and the server host to your local IP and port. for development and production use different ports!

go to your installation directory and start ghost with
  npm start

to auto-start ghost i found this tutorial using forever (and others)
Forever (
You can use forever to run Ghost as a background task. forever will also take care of your Ghost installation and it will restart the node process if it crashes.
To install forever type

  npm install forever -g
To start Ghost using forever from the Ghost installation directory type
  NODE_ENV=production forever start index.js
To stop Ghost type
  forever stop index.js
To check if Ghost is currently running type

  forever list

to edit/make themes read this


are stored in content/images/YYYY/mmm

update (from here)

Warning: Do NOT copy and paste the entire Ghost folder over the top of an existing installation on mac. Do NOT choose REPLACE if uploading with Transmit or other FTP software, choose MERGE.
  1. Update/upgrade pi
  2. Download the latest version of Ghost from
  3. Extract the zip file to a temporary location
  4. Delete existing index.js and package.json then copy new index.js and package.json files to the same directory.
  5. Next, delete the old core directory completely, and then put the new core directory in its place.
  6. For releases which include update to Casper (the default theme), delete the old content/themes/casper directory and put the new one its place
  7. Run sudo npm install –production
  8. Finally, Restart Ghost so that the changes take effect

edit html

to add custom elements (js, css, …) to your post/site edit the following file – don’t forget to restart ghost after editing this file!

call the js-function eg with on-load-method

<body class="{{body_class}}" onload='testfkt();'>

get the text of a post


add new fonts

1. add font to default.hbs

<link rel="stylesheet" type="text/css" href="//,700,400italic|Open+Sans:700,400|UnifrakturMaguntia&subset=all" />

2. add font to css

@font-face { font-family: "myFont"; src: local("myFont"), url("") format("TrueType") }

solve performance problems for login

this discussion gives a nice hint…
go to your root-dir of ghost and then:

sudo npm install bcrypt

This takes a while…
Then in core/server/models/user.js, change

bcrypt         = require('bcryptjs')


bcrypt         = require('bcrypt')

then restart ghost and 🙂

edit first page / homepage

the first page lists the latest blog-posts. to edit eg the number of words for each blog-post that should be displayed here, edit the file ghost/content/themes/<theme>/partials/loop.hbs and change the attribute excerpt words.

see doc

<section class="post-excerpt">
 <p>{{excerpt words="10"}} <a class="read-more" href="{{url}}">&raquo;</a></p>

remove this block from your screen.css to delete the circle between posts on the start-page

.post:after {
 display: block;
 content: "";
 width: 7px;
 height: 7px;
 border: #E7EEF2 1px solid;
 position: absolute;
 bottom: -5px;
 left: 50%;
 margin-left: -5px;
 background: #FFF;
 -webkit-border-radius: 100%;
 -moz-border-radius: 100%;
 border-radius: 100%;
 box-shadow: #FFF 0 0 0 5px;


upgrade ghost
ghost config
ghost forum


Button press with python & GPIO on raspberry pi

the code sample is taken from here.
i just use one button with the interrupt version, but i’m not quite satisfied with my dummy-button work around 😦

every button press mpd is started or stopped (see my_callback).

#!/usr/bin/env python2.7  
# script by Alex Eames  
from datetime import datetime
import RPi.GPIO as GPIO  
import os
import mpd

# GPIO 23 & 24 set up as inputs. One pulled up, the other down.  
# 23 will go to GND when button pressed and 24 will go to 3V3 (3.3V)  
# this enables us to demonstrate both rising and falling edge detection  
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)  
# dummy !!
GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)  
# now we’ll define the threaded callback function  
# this will run in another thread when our event is detected  
def my_callback(channel):
    print str(
    client = mpd.MPDClient(use_unicode=True)
    client.connect(„localhost“, 6600)
    #print client.status()
    if client.status()[’state‘] in (‚play‘, ‚pause‘):

# The GPIO.add_event_detect() line below set things up so that  
# when a rising edge is detected on port 23, regardless of whatever   
# else is happening in the program, the function „my_callback“ will be run  
# Stop the program with CTRL+C
GPIO.add_event_detect(23, GPIO.FALLING, callback=my_callback, bouncetime=300)
    print „Waiting for falling edge on port 24“  
    GPIO.wait_for_edge(24, GPIO.RISING)  
    print „Falling edge detected. Here endeth the second lesson.“  

except KeyboardInterrupt:  
    GPIO.cleanup()       # clean up GPIO on CTRL+C exit  

GPIO.cleanup()           # clean up GPIO on normal exit   

i used this mpd library for python (see doc for the library)
to install it, just do
  sudo pip install python-mpd2
to start the python scritp at system start add a line to /etc/rc.local
  sudo nano /etc/rc.local At the bottom, just above exit 0 we’ll add a call to our script (taken from here
  python ../
playlists cleanup with python
add new playlists (or songs with .add) to mpc
the file bbc6.m3u contains just