Get bigger image than wp_get_attachment_thumb_url

I’m trying to update my Google Sitemaps plugin and here is the code where it puts together the post image url:

protected function get_image_data($image_id)
        $image = get_post($image_id);

        return array(
            'location' => wp_get_attachment_thumb_url($image->ID),
            'title'    => $image->post_title,
            'caption'  => $image->post_excerpt

I want to use the ‘large’ image size instead of the thumbnail. Having trouble to get it work.

All feedback appreciated!

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