Kurt Schwehr schwehr

schwehr / xdrposix.c

Last active January 7, 2023 00:22

hdf4 xdrposix.c cleanup ideas

	/*
	* XDR implementation on POSIX file interface, with buffering
	*
	* Copyright (C) 1992, University Corp for Atmospheric Research
	*
	* This set of routines implements a XDR on a POSIX file descriptor.
	* XDR_ENCODE serializes onto the descriptor, XDR_DECODE de-serializes
	* from the descriptor. As in stdio, we buffer i/o. This XDR is most
	* useful when the descriptor actually represents a file. It
	* corrects some performance problems with xdrstdio_getpos() and

schwehr / hdf_file_fuzzer.cc

Created December 24, 2022 18:31

An hdf4 fuzzer. This is way too simple, but it has found at least one bug.

	#include <stddef.h>
	#include <stdint.h>
	#include <stdlib.h>

	// Copyright 2019 Google LLC.
	// SPDX-License-Identifier: Apache-2.0

	#include "fuzzer_temp_file.h"
	#include "third_party/hdf4/hdf/src/hdf.h"

schwehr / all_keys.py

Last active May 3, 2022 22:43

List all of the variables found across the entire set of ICOADS netcdf ICOADS R3.0.0 data

	#!/usr/bin/env python3

	# Copyright 2022 Google LLC.
	# SPDX-License-Identifier: Apache-2.0

	import pathlib
	import pprint
	import xarray as xr

	ignore_attrs = [

schwehr / ORG_SUBORG_dataset_v5.json

Created April 18, 2022 21:13

Example STAC JSON output from Earth Engine catalog entry

	{
	"description": "Contents of `description.md`.\n",
	"gee:type": "image",
	"id": "ORG/SUBORG/dataset/v5",
	"keywords": [
	"coral",
	"ocean"
	],
	"license": "CC-BY-4.0",
	"links": [

schwehr / ORG_SUBORG_dataset_v5.jsonnet

Last active April 18, 2022 21:58

Example Earth Engine catalog entry

	// Copyright 2022 Google LLC.
	// SPDX-License-Identifier: Apache-2.0
	local id = 'ORG/SUBORG/dataset/v5';
	local subdir = 'ORG';

	local ee_const = import 'earthengine_const.libsonnet';
	local ee = import 'earthengine.libsonnet';
	local spdx = import 'spdx.libsonnet';

	local version = 'v5';

schwehr / earthengine.libsonnet

Last active April 18, 2022 20:12

Example helper functions for STAC Jsonnet as of Apr 2022

	// Copyright 2022 Google LLC.
	// SPDX-License-Identifier: Apache-2.0
	local ee_const = import 'earthengine_const.libsonnet';
	{
	producer_provider(name, url):
	{ name: name, roles: ['producer', 'licensor'], url: url },
	processor_provider(name, url):
	{ name: name, roles: ['processor'], url: url },

	extent(xmin, ymin, xmax, ymax, start, end):: {

schwehr / earthengine_const.libsonnet

Last active April 18, 2022 20:07

Example constant definition for STAC Jsonnet as of Apr 2022

	// Copyright 2022 Google LLC.
	// SPDX-License-Identifier: Apache-2.0
	{
	stac_version: '1.0.0',
	stac_type: {
	catalog: 'Catalog',
	collection: 'Collection',
	item: 'Item',
	},
	media_type: {

schwehr / ccom.bash

Created April 8, 2022 22:10

CCOM Law of the Sea (LOTS) Extended Continental Shelf (ECS) data

	#!/bin/bash

	if [[ ! -f orig/Atlantic_ESRI_MOS.zip ]]
	then

	mkdir orig
	pushd orig

	# https://ccom.unh.edu/theme/law-sea

schwehr / demo_stac_json_file_validation.py

Created March 23, 2022 20:21

Prototype code to investigate strategies for validating EE STAC

	// Copyright 2022 Google LLC.
	// SPDX-License-Identifier: Apache-2.0

	def check_stac_collection(collection: Dict[str, Any]):
	# Field that must always be present
	assert jp.parse('$.id').find(collection)
	assert jp.parse('$.extent').find(collection)
	assert jp.parse('$.extent.spatial').find(collection)
	assert jp.parse('$.extent.temporal').find(collection)
	assert jp.parse('$.\'gee:terms_of_use\'').find(collection)

schwehr / hycom_demo.js

Created March 15, 2022 16:03

HYCOM Velocity in Google Earth Engine

	// Copyright 2019 Google LLC.
	// SPDX-License-Identifier: Apache-2.0
	//
	// Hycom in Earth Engine demo by Kurt Schwehr
	//
	// https://code.earthengine.google.com/b475a38642624aca72fecafaa3f311ab

	var extent = ee.Geometry.Polygon([-180, 80.48, -180, -80.48, 180, -80.48, 180, 80.48], null, false);
	// var date_range = ee.Filter.date('2018-08-01', '2018-08-10');