jenningsanderson

What are the Daylight OpenStreetMap Parquet Files?

Listed on the registry of Open Data on AWS, the Daylight OpenStreetMap Parquet files contain the latest Daylight Map Distribution of OpenStreetMap in an analysis-ready format. This dataset is optimized for cloud-based queries with Amazon Athena, meaning anyone can access the entire dataset with SQL queries in the browser, without the need to download or access the files directly.

The Daylight Map Distribution of OpenStreetMap is always openly available for download in the standard OSM PBF format (find it at daylightmap.org). The parquet files, however, were first made available alongside Daylight release v1.9. They contain fully resolved geometries and additional metadata including areas, lengths, and quadkeys, not present in the PBF.

In total, the OSM features files contain nearly 1B features including 178M+ nodes, 816M+ ways, and 5M+ relations. These are all _renderable f

gearbox

https://gis.stackexchange.com/questions/115433/online-wkt-and-geojson-viewer

Look at:

Are there any online WKT editors?

GeoJSON and WKT

OpenLayers vector formats

noamtamim

How to use PlantUML with Markdown

PlantUML is a really awesome way to create diagrams by writing code instead of drawing and dragging visual elements. Markdown is a really nice documentation tool.

Here's how I combine the two, to create docs with embedded diagrams.

Step 0: Setup

Get the command-line PlantUML from the download page or your relevant package manager.

brandon1024

A Comparison of Legacy and Modern Frontend Frameworks in Enterprise Software

TL;DR

At the time of its release, ExtJS was seen by the software development community as an incredible innovation in the world of JavaScript frontend frameworks. However, over time ExtJS consistently fell short and shook the fleeing community it had once established. Result of a complicated complex architecture, performance issues, and several licensing controversies, several other frameworks had been introduced into a space where ExtJS, once a popular framework for building enterprise software, had fallen short. With a disappearing community, meager documentation, poor performance and significant licensing cost, ExtJS is quickly becoming a deprecated technology.

One such framework, ReactJS, entered into the space to compete against ExtJS and other big players in the industry; a promising framework that was lightning fast, robust and easy to maintain. Over the years since its release, it has gained significant traction and h

arun-gupta

Knative on Kubernetes on AWS

Knative requires Kubernetes 1.10 and Istio 0.8.0 to be installed. It also requires default namespace injection for Istio to be enabled which rules out EKS as a deployment platform. One of Istio pods is failing and so it cannot be installed on a kops-based cluster as well. This is filed as knative/docs#359.

EKS

• Install eksctl: brew install weaveworks/tap/eksctl
• Create EKS cluster: eksctl create cluster --name myeks --nodes 4 --region us-west-2

simoami

SOCIAL ACTIVITY STREAM GRAPH

Introduction

clhenrick

Data URI SVG icons with Leaflet

Demonstrates how to load SVG's as Leaflet icons via the data URI method.

Following was helpful to figure this out:

• Optimizing SVGs in Data URIs
• http://codepen.io/gabrien/pen/NqGvGq
• http://codepen.io/chriscoyier/pen/ZQgvyG/

oleq

What is this all about?

This tutorial will turn your Raspberry PI into a simple Bluetooth audio receiver, which plays music through connected speakers. It's like a regular car audio system, but it can be used anywhere and it's a good value.

   Audio source (i.e. smartphone) 
                |
                v
 (((  Wireless Bluetooth Channel  )))
 |

shreyaskarnik

• With Docker 1.8.0 shipped new log-driver for GELF via UDP, this means that the logs from Docker Container(s) can be shipped directly to the ELK stack for further analysis.
• This tutorial will illustrate how to use the GELF log-driver with Docker engine.
• Step 1: Setup ELK Stack:
  • docker run -d --name es elasticsearch
  • docker run -d --name logstash --link es:elasticsearch logstash -v /tmp/logstash.conf:/config-dir/logstash.conf logstash logstash -f /config-dir/logstash.conf
  • Note the config for Logstash can be found at this link
  • docker run --link es:elasticsearch -d kibana
• Once the ELK stack is up now let's fire up our nginx container which ships its logs to ELK stack.

• LOGSTASH_ADDRESS=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' logstash)
• `docker run -d --net=host --log-driver=gelf --log-opt gelf-address=u

janikvonrotz

SQL languages

DDL is short name of Data Definition Language, which deals with database schemas and descriptions, of how the data should reside in the database.

DML is short name of Data Manipulation Language which deals with data manipulation, and includes most common SQL statements such SELECT, INSERT, UPDATE, DELETE etc, and it is used to store, modify, retrieve, delete and update data in database.

DCL is short name of Data Control Language which includes commands such as GRANT, and mostly concerned with rights, permissions and other controls of the database system.

Datatypes

Text types