spatialreference.org

https://spatialreference.org· First analyzed 06 May 2026· Updated 06 May 2026

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Mobile

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Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.110.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

NS6.PAIRNIC.COM.NS5.PAIRNIC.COM.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

505 ms10%

Speed Index

656 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

19 KB

5 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Platform

GitHub Pages

CDN

Fastly

SEO Analysis

D53/100

Meta Tags5/15

Content9/12

Headings3/8

Technical15/25

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

spatialreference.orgspatialreference.org

Home -- Spatial Reference

Spatial Reference catalog of coordinate reference systems

Title Length25 chars

Recommended: 50-60 chars (~153px / 580px)

Description Length57 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

9 issues found

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Crawlability

Sitemap

Type: standard

13,803 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F30/100

Bot Access

20/25

Machine Read.

4/25

Schema Data

0/25

Citation

6/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:41%

Words:230

Token eff.:Too Short

Sections/1K:8.7

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 5.5w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

AI readiness recommendation preview...

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

62/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

7/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

60/100

A+

2 mg

CO₂e / view

19.4 KB

Page Weight

95%

Cleaner Than

New Visitor

3 mg

Returning (cached)

1 mg

Annual (10K/mo)

288 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

JavaScript

4.6 KB

Images

10.9 KB

CSS

2.1 KB

HTML

1.8 KB

Green Hosting Not Verified

GitHub Pages

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

86d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

02.05.2026

Valid Until

31.07.2026

Subject Alternative Names (1)

spatialreference.org

SHA-256 Fingerprint

A7:86:80:EF:73:2C:D3:3B:68:62:44:BD:6A:FE:4D:68:DA:FD:92:79...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

1531

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

spatialreference.org

Domain Age

18y 9m

Created

23.07.2007

Expires

23.07.2026

Last Updated

27.06.2025

Registrar

pair Networks, Inc. d/b/a pair Domains

DNSSEC

Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

53/100

Mobile Friendly

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Verdana

WCAG AA

61/100

Readability

/30

17/30

15px · LH --

Hierarchy

/20

8/20

WCAG

/25

22/25

5.61:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Verdana

Sans

Body Font

Verdana

Sans15px

Contrast Ratio

5.61:1

WCAG AA (≥4.5:1)

Reading Comfort

Single Font Family

left aligned

23px

15px

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Hard to read: Flesch score 31/100. Simplify sentences for wider reach.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.6:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 31

Color Palette

7 unique colors

3.26:1 AA Large Light

#ffffff

Background· 70.89999999999999%

#898f97

Other· 2.1%

#99b3cc

Primary· 8.1%

#bbd6de

Secondary· 3.9%

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Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

.(1)

Website Identity

spatialreference.org

18 years old

Location detected: 🇺🇸 United Statesvia ip

pair Networks, Inc. d/b/a pair Domainsen

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Last analyzed: 06 May 2026 at 02:29

Historical Analysis & Change Tracking