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12 changed files with 43 additions and 85 deletions

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@ -1,12 +1,10 @@
from flask import Flask, jsonify, request, json, Response, send_from_directory, abort
from flask import Flask, request, json, Response
from flask_cors import CORS
import orjson, os
import orjson
app = Flask(__name__)
CORS(app)
FILES_DIRECTORY = '../data/'
@app.route('/bitcoin_business_growth_by_country', methods=['GET'])
def business_growth():
# Parse args from request
@ -38,26 +36,45 @@ def business_growth():
# Return json
return Response(json.dumps(sorted_data), mimetype='application/json')
@app.route('/get_json/<filename>', methods=['GET'])
def get_json(filename):
file_path = os.path.join(FILES_DIRECTORY, filename)
if not os.path.isfile(file_path):
abort(404)
@app.route('/price', methods=['GET'])
def price():
with open(file_path, 'r') as file:
data = json.load(file)
# Open json locally
with open('../data/final__price.json', 'rb') as f:
data = orjson.loads(f.read())
return jsonify(data)
# Return json
return Response(json.dumps(data), mimetype='application/json')
@app.route('/download/<filename>', methods=['GET'])
def download_file(filename):
try:
return send_from_directory(FILES_DIRECTORY, filename, as_attachment=True)
except FileNotFoundError:
abort(404)
@app.route('/miner_rewards', methods=['GET'])
def miner_rewards():
if __name__ == '__main__':
app.run(debug=True)
# Open json locally
with open('../data/final__miner_rewards.json', 'rb') as f:
data = orjson.loads(f.read())
# Return json
return Response(json.dumps(data), mimetype='application/json')
@app.route('/hashrate', methods=['GET'])
def hashrate():
# Open json locally
with open('../data/dev/final__hashrate.json', 'rb') as f:
data = orjson.loads(f.read())
# Return json
return Response(json.dumps(data), mimetype='application/json')
@app.route('/feerates', methods=['GET'])
def feerates():
# Open json locally
with open('../data/final__feerate_percentiles.json', 'rb') as f:
data = orjson.loads(f.read())
# Return json
return Response(json.dumps(data), mimetype='application/json')
if __name__ == '__main__':
app.run()

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@ -4,11 +4,7 @@ toc: False
# Grounded Insights from Open Data
This site is currently under construction. The direction I intend for this site to take is as a place to publish analytical insights derived from open data. I have a page called [Data Lab](/data-lab) where I publish interactive analytical dashboards, a blog to publish tutorials and thoughts on various related topics, and a [data downloads](/data-download) page for data access.
I'm interested in a broad set of topics such as Linux, analytics and data engineering, GIS and bitcoin. So expect to see content related to these topics published on this site.
I strongly believe in the philosophy of [Free Software](https://www.gnu.org/philosophy/free-sw.html) and [Open Data](https://en.wikipedia.org/wiki/Open_data). Therefore, all material on this site is released into the public domain unless otherwise specified. For more information, see [here](/license).
Data is often chaotic and dispersed. This requires us to build solid data pipelines to efficiently transform data into a unified and useful format.
### Explore Based Data

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@ -24,7 +24,7 @@ The final image looks like this:
It's possible to download the entire SRTM (Shuttle Radar Topography Mission) satellite imagery dataset and insert it into a Postgres database for personal use. This can be helpful for if you need global elevation data for your analysis and don't want to be limited by third-parties APIs.
The SRTM is a near-global dataset of elevation data with a resolution of 1-arc-second (30m). More information is available from [USGS](https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-shuttle-radar-topography-mission-srtm?qt-science_center_objects=0#qt-science_center_objects).
In this guide we will go through the process of downloading the data, inserting it into a Postgres database with PostGIS, then querying the final result to create a DEM for any country or region.
In this guide we will go through downloading the data, inserting it into a Postgres database with PostGIS, then querying the final result to create a DEM for any country or region.
This guide assumes you are using Linux (this may also apply to other Unix like systems such as MacOS) and have a Postgres database with the PostGIS extension installed. More information on how to do this can be found on the [PostGIS](https://postgis.net/documentation/getting_started/) website.
@ -51,8 +51,6 @@ Next we can run the following command to download the rasters. This will take so
aws s3 cp s3://raster/SRTM_GL1/ . --recursive --endpoint-url https://opentopography.s3.sdsc.edu --no-sign-request
{{</ highlight >}}
If you'd prefer to download specific rasters or rasters for a region instead, you can checkout this [website](https://dwtkns.com/srtm30m/).
## Using raster2pgsql to import raster tiles into PostGIS
Now we have the data downloaded on our system, we can import it into our database.
If we look inside the SRTM_GL1_srtm directory, we can see all of the 14280 raster files:
@ -220,7 +218,5 @@ vacuum analyze "dem"."singapore_srtm";
Looks much better!
This DEM raster of Singapore is available for download from the downloads page [here](/data-downloads/singapore-srtm)
#### Citations
NASA Shuttle Radar Topography Mission (SRTM)(2013). Shuttle Radar Topography Mission (SRTM) Global. Distributed by OpenTopography. https://doi.org/10.5069/G9445JDF. Accessed: 2024-08-06

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@ -1,5 +0,0 @@
---
title: "Data Downloads"
---
Data available for download

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@ -1,17 +0,0 @@
---
title: 'Singapore SRTM DEM (Data Download)'
date: 2024-08-06T12:15:44+01:00
author:
name: "Sam Chance"
header_image: '/pics/blog/batch-import-postgis-rasters/singapore-final.webp'
summary: "Download the Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) of Singapore"
toc: false
tags: ["QGIS", "SRTM", "DEM", "Raster", "download"]
---
{{< figure src="/pics/blog/batch-import-postgis-rasters/singapore-final.webp" width="300">}}
Download the Digital Elevation Model featured in [this](/blog/batch-import-postgis-rasters/) blog.
{{< download-data src="http://localhost:5000/download/singapore-srtm-dem.tif" name="singapore-srtm-dem.tif" >}}
#### Citations
NASA Shuttle Radar Topography Mission (SRTM)(2013). Shuttle Radar Topography Mission (SRTM) Global. Distributed by OpenTopography. https://doi.org/10.5069/G9445JDF. Accessed: 2024-08-06

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@ -5,7 +5,6 @@
<a href="#" class="dropbtn">Projects</a>
<div class="navbar-link-dropdown-content">
<a href="/data-lab">Data Lab</a>
<a href="/data-downloads">Data Downloads</a>
<a href="https://semitamaps.com">Map Printing</a>
</div>
</li>

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@ -1,21 +0,0 @@
<button class="download-button" onclick="downloadFile('{{ .Get "src" }}', '{{ .Get "name" }}')">
Download
</button>
<script>
async function downloadFile(url, name) {
try {
const response = await fetch(url);
const blob = await response.blob();
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = name;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
} catch (error) {
console.error('Error downloading the file:', error);
}
}
</script>

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@ -303,7 +303,3 @@ ol {
margin-bottom: 1rem;
font-size: 22px;
}
.download-button {
padding: 10px;
}

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@ -3,7 +3,7 @@ const myChart = echarts.init(document.getElementById("chart"));
async function fetchDataForChart() {
try {
const apiEndpoint = "https://api.bitlab21.com/get_json/final__price.json";
const apiEndpoint = "https://api.bitlab21.com/price";
const response = await fetch(apiEndpoint);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);

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@ -3,8 +3,7 @@ const myChart = echarts.init(document.getElementById("chart"));
async function fetchDataForChart() {
try {
const apiEndpoint =
"https://api.bitlab21.com/get_json/final__feerate_percentiles.json";
const apiEndpoint = "https://api.bitlab21.com/feerates";
const response = await fetch(apiEndpoint);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);

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@ -3,8 +3,7 @@ const myChart = echarts.init(document.getElementById("chart"));
async function fetchDataForChart() {
try {
const apiEndpoint =
"https://api.bitlab21.com/get_json/final__hashrate.json";
const apiEndpoint = "https://api.bitlab21.com/hashrate";
const response = await fetch(apiEndpoint);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);

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@ -3,8 +3,7 @@ const myChart = echarts.init(document.getElementById("chart"));
async function fetchDataForChart() {
try {
const apiEndpoint =
"https://api.bitlab21.com/get_json/final__miner_rewards.json";
const apiEndpoint = "https://api.bitlab21.com/miner_rewards";
const response = await fetch(apiEndpoint);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);